# This is only meant to add docs to objects defined in C-extension modules. # The purpose is to allow easier editing of the docstrings without # requiring a re-compile. # NOTE: Many of the methods of ndarray have corresponding functions. # If you update these docstrings, please keep also the ones in # core/fromnumeric.py, core/defmatrix.py up-to-date. from lib import add_newdoc add_newdoc('numpy.core', 'dtype', """Create a data type. A numpy array is homogeneous, and contains elements described by a dtype. A dtype can be constructed from different combinations of fundamental numeric types, as illustrated below. Examples -------- Using array-scalar type: >>> np.dtype(np.int16) dtype('int16') Record, one field name 'f1', containing int16: >>> np.dtype([('f1', np.int16)]) dtype([('f1', '>> np.dtype([('f1', [('f1', np.int16)])]) dtype([('f1', [('f1', '>> np.dtype([('f1', np.uint), ('f2', np.int32)]) dtype([('f1', '>> np.dtype([('a','f8'),('b','S10')]) dtype([('a', '>> np.dtype("i4, (2,3)f8") dtype([('f0', '>> np.dtype([('hello',(np.int,3)),('world',np.void,10)]) dtype([('hello', '>> np.dtype((np.int16, {'x':(np.int8,0), 'y':(np.int8,1)})) dtype(('>> np.dtype({'names':['gender','age'], 'formats':['S1',np.uint8]}) dtype([('gender', '|S1'), ('age', '|u1')]) Offsets in bytes, here 0 and 25: >>> np.dtype({'surname':('S25',0),'age':(np.uint8,25)}) dtype([('surname', '|S25'), ('age', '|u1')]) """) add_newdoc('numpy.core', 'dtype', """ Create a data type. A numpy array is homogeneous, and contains elements described by a dtype. A dtype can be constructed from different combinations of fundamental numeric types, as illustrated below. Examples -------- Using array-scalar type: >>> np.dtype(np.int16) dtype('int16') Record, one field name 'f1', containing int16: >>> np.dtype([('f1', np.int16)]) dtype([('f1', '>> np.dtype([('f1', [('f1', np.int16)])]) dtype([('f1', [('f1', '>> np.dtype([('f1', np.uint), ('f2', np.int32)]) dtype([('f1', '>> np.dtype([('a','f8'),('b','S10')]) dtype([('a', '>> np.dtype("i4, (2,3)f8") dtype([('f0', '>> np.dtype([('hello',(np.int,3)),('world',np.void,10)]) dtype([('hello', '>> np.dtype((np.int16, {'x':(np.int8,0), 'y':(np.int8,1)})) dtype(('>> np.dtype({'names':['gender','age'], 'formats':['S1',np.uint8]}) dtype([('gender', '|S1'), ('age', '|u1')]) Offsets in bytes, here 0 and 25: >>> np.dtype({'surname':('S25',0),'age':(np.uint8,25)}) dtype([('surname', '|S25'), ('age', '|u1')]) """) ############################################################################### # # flatiter # # flatiter needs a toplevel description # ############################################################################### # attributes add_newdoc('numpy.core', 'flatiter', ('base', """documentation needed """)) add_newdoc('numpy.core', 'flatiter', ('coords', """An N-d tuple of current coordinates. """)) add_newdoc('numpy.core', 'flatiter', ('index', """documentation needed """)) # functions add_newdoc('numpy.core', 'flatiter', ('__array__', """__array__(type=None) Get array from iterator """)) add_newdoc('numpy.core', 'flatiter', ('copy', """copy() Get a copy of the iterator as a 1-d array """)) ############################################################################### # # broadcast # ############################################################################### # attributes add_newdoc('numpy.core', 'broadcast', ('index', """current index in broadcasted result """)) add_newdoc('numpy.core', 'broadcast', ('iters', """tuple of individual iterators """)) add_newdoc('numpy.core', 'broadcast', ('nd', """number of dimensions of broadcasted result """)) add_newdoc('numpy.core', 'broadcast', ('numiter', """number of iterators """)) add_newdoc('numpy.core', 'broadcast', ('shape', """shape of broadcasted result """)) add_newdoc('numpy.core', 'broadcast', ('size', """total size of broadcasted result """)) ############################################################################### # # numpy functions # ############################################################################### add_newdoc('numpy.core.multiarray', 'array', """ array(object, dtype=None, copy=True, order=None, subok=True, ndmin=True) Create an array. Parameters ---------- object : array-like An array, any object exposing the array interface, an object whose __array__ method returns an array, or any (nested) sequence. dtype : data-type, optional The desired data-type for the array. If not given, then the type will be determined as the minimum type required to hold the objects in the sequence. This argument can only be used to 'upcast' the array. For downcasting, use the .astype(t) method. copy : bool, optional If true (default), then the object is copied. Otherwise, a copy will only be made if __array__ returns a copy, if obj is a nested sequence, or if a copy is needed to satisfy any of the other requirements (`dtype`, `order`, etc.). order : {'C', 'F', 'A'}, optional Specify the order of the array. If order is 'C' (default), then the array will be in C-contiguous order (last-index varies the fastest). If order is 'F', then the returned array will be in Fortran-contiguous order (first-index varies the fastest). If order is 'A', then the returned array may be in any order (either C-, Fortran-contiguous, or even discontiguous). subok : bool, optional If True, then sub-classes will be passed-through, otherwise the returned array will be forced to be a base-class array. ndmin : int, optional Specifies the minimum number of dimensions that the resulting array should have. Ones will be pre-pended to the shape as needed to meet this requirement. Examples -------- >>> np.array([1, 2, 3]) array([1, 2, 3]) Upcasting: >>> np.array([1, 2, 3.0]) array([ 1., 2., 3.]) More than one dimension: >>> np.array([[1, 2], [3, 4]]) array([[1, 2], [3, 4]]) Minimum dimensions 2: >>> np.array([1, 2, 3], ndmin=2) array([[1, 2, 3]]) Type provided: >>> np.array([1, 2, 3], dtype=complex) array([ 1.+0.j, 2.+0.j, 3.+0.j]) Data-type consisting of more than one element: >>> x = np.array([(1,2),(3,4)],dtype=[('a','>> x['a'] array([1, 3]) Creating an array from sub-classes: >>> np.array(np.mat('1 2; 3 4')) array([[1, 2], [3, 4]]) >>> np.array(np.mat('1 2; 3 4'), subok=True) matrix([[1, 2], [3, 4]]) """) add_newdoc('numpy.core.multiarray', 'empty', """ empty(shape, dtype=float, order='C') Return a new array of given shape and type, without initialising entries. Parameters ---------- shape : {tuple of int, int} Shape of the empty array dtype : data-type, optional Desired output data-type. order : {'C', 'F'}, optional Whether to store multi-dimensional data in C (row-major) or Fortran (column-major) order in memory. See Also -------- empty_like, zeros Notes ----- `empty`, unlike `zeros`, does not set the array values to zero, and may therefore be marginally faster. On the other hand, it requires the user to manually set all the values in the array, and should be used with caution. Examples -------- >>> np.empty([2, 2]) array([[ -9.74499359e+001, 6.69583040e-309], #random data [ 2.13182611e-314, 3.06959433e-309]]) >>> np.empty([2, 2], dtype=int) array([[-1073741821, -1067949133], #random data [ 496041986, 19249760]]) """) add_newdoc('numpy.core.multiarray','scalar', """scalar(dtype,obj) Return a new scalar array of the given type initialized with obj. Mainly for pickle support. The dtype must be a valid data-type descriptor. If dtype corresponds to an OBJECT descriptor, then obj can be any object, otherwise obj must be a string. If obj is not given it will be interpreted as None for object type and zeros for all other types. """) add_newdoc('numpy.core.multiarray', 'zeros', """ zeros(shape, dtype=float, order='C') Return a new array of given shape and type, filled with zeros. Parameters ---------- shape : {tuple of ints, int} Shape of the new array, e.g., ``(2, 3)`` or ``2``. dtype : data-type, optional The desired data-type for the array, e.g., `numpy.int8`. Default is `numpy.float64`. order : {'C', 'F'}, optional Whether to store multidimensional data in C- or Fortran-contiguous (row- or column-wise) order in memory. Returns ------- out : ndarray Array of zeros with the given shape, dtype, and order. See Also -------- numpy.zeros_like : Return an array of zeros with shape and type of input. numpy.ones_like : Return an array of ones with shape and type of input. numpy.empty_like : Return an empty array with shape and type of input. numpy.ones : Return a new array setting values to one. numpy.empty : Return a new uninitialized array. Examples -------- >>> np.zeros(5) array([ 0., 0., 0., 0., 0.]) >>> np.zeros((5,), dtype=numpy.int) array([0, 0, 0, 0, 0]) >>> np.zeros((2, 1)) array([[ 0.], [ 0.]]) >>> s = (2,2) >>> np.zeros(s) array([[ 0., 0.], [ 0., 0.]]) >>> np.zeros((2,), dtype=[('x', 'i4'), ('y', 'i4')]) array([(0, 0), (0, 0)], dtype=[('x', '>> np.fromstring('\\x01\\x02', dtype=np.uint8) array([1, 2], dtype=uint8) >>> np.fromstring('1 2', dtype=int, sep=' ') array([1, 2]) >>> np.fromstring('1, 2', dtype=int, sep=',') array([1, 2]) >>> np.fromstring('\\x01\\x02\\x03\\x04\\x05', dtype=np.uint8, count=3) array([1, 2, 3], dtype=uint8) Invalid inputs: >>> np.fromstring('\\x01\\x02\\x03\\x04\\x05', dtype=np.int32) Traceback (most recent call last): File "", line 1, in ValueError: string size must be a multiple of element size >>> np.fromstring('\\x01\\x02', dtype=np.uint8, count=3) Traceback (most recent call last): File "", line 1, in ValueError: string is smaller than requested size """) add_newdoc('numpy.core.multiarray', 'fromiter', """ fromiter(iterable, dtype, count=-1) Create a new 1-dimensional array from an iterable object. Parameters ---------- iterable : iterable object An iterable object providing data for the array. dtype : data-type The data type of the returned array. count : int, optional The number of items to read from iterable. The default is -1, which means all data is read. Returns ------- out : ndarray The output array. Notes ----- Specify ``count`` to improve performance. It allows ``fromiter`` to pre-allocate the output array, instead of resizing it on demand. Examples -------- >>> iterable = (x*x for x in range(5)) >>> np.fromiter(iterable, np.float) array([ 0., 1., 4., 9., 16.]) """) add_newdoc('numpy.core.multiarray', 'fromfile', """ fromfile(file, dtype=float, count=-1, sep='') Construct an array from data in a text or binary file. A highly efficient way of reading binary data with a known data-type, as well as parsing simply formatted text files. Data written using the `tofile` method can be read using this function. Parameters ---------- file : file or string Open file object or filename. dtype : data-type Data type of the returned array. For binary files, it is used to determine the size and byte-order of the items in the file. count : int Number of items to read. ``-1`` means all items (i.e., the complete file). sep : string Separator between items if file is a text file. Empty ("") separator means the file should be treated as binary. Spaces (" ") in the separator match zero or more whitespace characters. A separator consisting only of spaces must match at least one whitespace. See also -------- load, save ndarray.tofile loadtxt : More flexible way of loading data from a text file. Notes ----- Do not rely on the combination of `tofile` and `fromfile` for data storage, as the binary files generated are are not platform independent. In particular, no byte-order or data-type information is saved. Data can be stored in the platform independent ``.npy`` format using `save` and `load` instead. Examples -------- Construct an ndarray: >>> dt = np.dtype([('time', [('min', int), ('sec', int)]), ... ('temp', float)]) >>> x = np.zeros((1,), dtype=dt) >>> x['time']['min'] = 10; x['temp'] = 98.25 >>> x array([((10, 0), 98.25)], dtype=[('time', [('min', '>> import os >>> fname = os.tmpnam() >>> x.tofile(fname) Read the raw data from disk: >>> np.fromfile(fname, dtype=dt) array([((10, 0), 98.25)], dtype=[('time', [('min', '>> np.save(fname, x) >>> np.load(fname + '.npy') array([((10, 0), 98.25)], dtype=[('time', [('min', '>> dt = np.dtype(int) >>> dt = dt.newbyteorder('>') >>> np.frombuffer(buf, dtype=dt) The data of the resulting array will not be byteswapped, but will be interpreted correctly. Examples -------- >>> s = 'hello world' >>> np.frombuffer(s, dtype='S1', count=5, offset=6) array(['w', 'o', 'r', 'l', 'd'], dtype='|S1') """) add_newdoc('numpy.core.multiarray', 'concatenate', """ concatenate((a1, a2, ...), axis=0) Join a sequence of arrays together. Parameters ---------- a1, a2, ... : sequence of ndarrays The arrays must have the same shape, except in the dimension corresponding to `axis` (the first, by default). axis : int, optional The axis along which the arrays will be joined. Default is 0. Returns ------- res : ndarray The concatenated array. See Also -------- array_split : Split an array into multiple sub-arrays of equal or near-equal size. split : Split array into a list of multiple sub-arrays of equal size. hsplit : Split array into multiple sub-arrays horizontally (column wise) vsplit : Split array into multiple sub-arrays vertically (row wise) dsplit : Split array into multiple sub-arrays along the 3rd axis (depth). hstack : Stack arrays in sequence horizontally (column wise) vstack : Stack arrays in sequence vertically (row wise) dstack : Stack arrays in sequence depth wise (along third dimension) Examples -------- >>> a = np.array([[1, 2], [3, 4]]) >>> b = np.array([[5, 6]]) >>> np.concatenate((a, b), axis=0) array([[1, 2], [3, 4], [5, 6]]) """) add_newdoc('numpy.core.multiarray', 'inner', """ inner(a, b) Inner product of two arrays. Ordinary inner product of vectors for 1-D arrays (without complex conjugation), in higher dimensions a sum product over the last axes. Parameters ---------- a, b : array_like If `a` and `b` are nonscalar, their last dimensions of must match. Returns ------- out : ndarray `out.shape = a.shape[:-1] + b.shape[:-1]` Raises ------ ValueError If the last dimension of `a` and `b` has different size. See Also -------- tensordot : Sum products over arbitrary axes. dot : Generalised matrix product, using second last dimension of `b`. Notes ----- For vectors (1-D arrays) it computes the ordinary inner-product:: np.inner(a, b) = sum(a[:]*b[:]) More generally, if `ndim(a) = r > 0` and `ndim(b) = s > 0`:: np.inner(a, b) = np.tensordot(a, b, axes=(-1,-1)) or explicitly:: np.inner(a, b)[i0,...,ir-1,j0,...,js-1] = sum(a[i0,...,ir-1,:]*b[j0,...,js-1,:]) In addition `a` or `b` may be scalars, in which case:: np.inner(a,b) = a*b Examples -------- Ordinary inner product for vectors: >>> a = np.array([1,2,3]) >>> b = np.array([0,1,0]) >>> np.inner(a, b) 2 A multidimensional example: >>> a = np.arange(24).reshape((2,3,4)) >>> b = np.arange(4) >>> np.inner(a, b) array([[ 14, 38, 62], [ 86, 110, 134]]) An example where `b` is a scalar: >>> np.inner(np.eye(2), 7) array([[ 7., 0.], [ 0., 7.]]) """) add_newdoc('numpy.core','fastCopyAndTranspose', """_fastCopyAndTranspose(a)""") add_newdoc('numpy.core.multiarray','correlate', """cross_correlate(a,v, mode=0)""") add_newdoc('numpy.core.multiarray', 'arange', """ arange([start,] stop[, step,], dtype=None) Return evenly spaced values within a given interval. Values are generated within the half-open interval ``[start, stop)`` (in other words, the interval including `start` but excluding `stop`). For integer arguments, the function is equivalent to ``range`` (but returns an array). Parameters ---------- start : number, optional Start of interval. The interval includes this value. The default start value is 0. end : number End of interval. The interval does not include this value. step : number, optional Spacing between values. For any output `out`, this is the distance between two adjacent values, ``out[i+1] - out[i]``. The default step size is 1. If `step` is specified, `start` must also be given. dtype : dtype The type of the output array. If `dtype` is not given, infer the data type from the other input arguments. Returns ------- out : ndarray Array of evenly spaced values. For floating point arguments, the length of the result is ``ceil((stop - start)/step)``. Because of floating point overflow, this rule may result in the last element of `out` being greater than `stop`. See Also -------- range : The Python equivalent for integers linspace : Evenly spaced numbers with careful handling of endpoints. ogrid: Arrays of evenly spaced numbers in N-dimensions mgrid: Grid-shaped arrays of evenly spaced numbers in N-dimensions Examples -------- >>> np.arange(3) array([0, 1, 2]) >>> np.arange(3.0) array([ 0., 1., 2.]) >>> np.arange(3,7) array([3, 4, 5, 6]) >>> np.arange(3,7,2) array([3, 5]) """) add_newdoc('numpy.core.multiarray','_get_ndarray_c_version', """_get_ndarray_c_version() Return the compile time NDARRAY_VERSION number. """) add_newdoc('numpy.core.multiarray','_reconstruct', """_reconstruct(subtype, shape, dtype) Construct an empty array. Used by Pickles. """) add_newdoc('numpy.core.multiarray', 'set_string_function', """ set_string_function(f, repr=1) Set a Python function to be used when pretty printing arrays. Parameters ---------- f : Python function Function to be used to pretty print arrays. The function should expect a single array argument and return a string of the representation of the array. repr : int Unknown. Examples -------- >>> def pprint(arr): ... return 'HA! - What are you going to do now?' ... >>> np.set_string_function(pprint) >>> a = np.arange(10) >>> a HA! - What are you going to do now? >>> print a [0 1 2 3 4 5 6 7 8 9] """) add_newdoc('numpy.core.multiarray', 'set_numeric_ops', """ set_numeric_ops(op1=func1, op2=func2, ...) Set numerical operators for array objects. Parameters ---------- op1, op2, ... : callable Each ``op = func`` pair describes an operator to be replaced. For example, ``add = lambda x, y: np.add(x, y) % 5`` would replace addition by modulus 5 addition. Returns ------- saved_ops : list of callables A list of all operators, stored before making replacements. Notes ----- .. WARNING:: Use with care! Incorrect usage may lead to memory errors. A function replacing an operator cannot make use of that operator. For example, when replacing add, you may not use ``+``. Instead, directly call ufuncs: >>> def add_mod5(x, y): ... return np.add(x, y) % 5 ... >>> old_funcs = np.set_numeric_ops(add=add_mod5) >>> x = np.arange(12).reshape((3, 4)) >>> x + x array([[0, 2, 4, 1], [3, 0, 2, 4], [1, 3, 0, 2]]) >>> ignore = np.set_numeric_ops(**old_funcs) # restore operators """) add_newdoc('numpy.core.multiarray', 'where', """ where(condition, [x, y]) Return elements, either from `x` or `y`, depending on `condition`. If only `condition` is given, return ``condition.nonzero()``. Parameters ---------- condition : array_like, bool When True, yield `x`, otherwise yield `y`. x, y : array_like, optional Values from which to choose. Returns ------- out : ndarray or tuple of ndarrays If both `x` and `y` are specified, the output array, shaped like `condition`, contains elements of `x` where `condition` is True, and elements from `y` elsewhere. If only `condition` is given, return the tuple ``condition.nonzero()``, the indices where `condition` is True. See Also -------- nonzero Notes ----- If `x` and `y` are given and input arrays are 1-D, `where` is equivalent to:: [xv if c else yv for (c,xv,yv) in zip(condition,x,y)] Examples -------- >>> x = np.arange(9.).reshape(3, 3) >>> np.where( x > 5 ) (array([2, 2, 2]), array([0, 1, 2])) >>> x[np.where( x > 3.0 )] # Note: result is 1D. array([ 4., 5., 6., 7., 8.]) >>> np.where(x < 5, x, -1) # Note: broadcasting. array([[ 0., 1., 2.], [ 3., 4., -1.], [-1., -1., -1.]]) >>> np.where([[True, False], [True, True]], ... [[1, 2], [3, 4]], ... [[9, 8], [7, 6]]) array([[1, 8], [3, 4]]) >>> np.where([[0, 1], [1, 0]]) (array([0, 1]), array([1, 0])) """) add_newdoc('numpy.core.multiarray', 'lexsort', """ lexsort(keys, axis=-1) Perform an indirect sort using a list of keys. Imagine three input keys, ``a``, ``b`` and ``c``. These can be seen as columns in a spreadsheet. The first row of the spreadsheet would therefore be ``a[0], b[0], c[0]``. Lexical sorting orders the different rows by first sorting on the on first column (key), then the second, and so forth. At each step, the previous ordering is preserved when equal keys are encountered. Parameters ---------- keys : (k,N) array or tuple containing k (N,)-shaped sequences The `k` different "columns" to be sorted. The last column is the primary sort column. axis : integer, optional Axis to be indirectly sorted. By default, sort over the last axis. Returns ------- indices : (N,) integer array Array of indices that sort the keys along the specified axis. See Also -------- argsort : Indirect sort. sort : In-place sort. Examples -------- Sort names: first by surname, then by name. >>> surnames = ('Hertz', 'Galilei', 'Hertz') >>> first_names = ('Heinrich', 'Galileo', 'Gustav') >>> ind = np.lexsort((first_names, surnames)) >>> ind array([1, 2, 0]) >>> [surnames[i] + ", " + first_names[i] for i in ind] ['Galilei, Galileo', 'Hertz, Gustav', 'Hertz, Heinrich'] Sort two columns of numbers: >>> a = [1,5,1,4,3,4,4] # First column >>> b = [9,4,0,4,0,2,1] # Second column >>> ind = np.lexsort((b,a)) # Sort by second, then first column >>> print ind [2 0 4 6 5 3 1] >>> [(a[i],b[i]) for i in ind] [(1, 0), (1, 9), (3, 0), (4, 1), (4, 2), (4, 4), (5, 4)] Note that the first elements are sorted. For each first element, the second elements are also sorted. A normal ``argsort`` would have yielded: >>> [(a[i],b[i]) for i in np.argsort(a)] [(1, 9), (1, 0), (3, 0), (4, 4), (4, 2), (4, 1), (5, 4)] Structured arrays are sorted lexically: >>> x = np.array([(1,9), (5,4), (1,0), (4,4), (3,0), (4,2), (4,1)], ... dtype=np.dtype([('x', int), ('y', int)])) >>> np.argsort(x) # or np.argsort(x, order=('x', 'y')) array([2, 0, 4, 6, 5, 3, 1]) """) add_newdoc('numpy.core.multiarray', 'can_cast', """ can_cast(from=d1, to=d2) Returns True if cast between data types can occur without losing precision. Parameters ---------- from: data type code Data type code to cast from. to: data type code Data type code to cast to. Returns ------- out : bool True if cast can occur without losing precision. """) add_newdoc('numpy.core.multiarray','newbuffer', """newbuffer(size) Return a new uninitialized buffer object of size bytes """) add_newdoc('numpy.core.multiarray','getbuffer', """getbuffer(obj [,offset[, size]]) Create a buffer object from the given object referencing a slice of length size starting at offset. Default is the entire buffer. A read-write buffer is attempted followed by a read-only buffer. """) ############################################################################## # # Documentation for ndarray attributes and methods # ############################################################################## ############################################################################## # # ndarray object # ############################################################################## add_newdoc('numpy.core.multiarray', 'ndarray', """ ndarray(shape, dtype=float, buffer=None, offset=0, strides=None, order=None) An array object represents a multidimensional, homogeneous array of fixed-size items. An associated data-type object describes the format of each element in the array (its byte-order, how many bytes it occupies in memory, whether it is an integer or a floating point number, etc.). Arrays should be constructed using `array`, `zeros` or `empty` (refer to the ``See Also`` section below). The parameters given here describe a low-level method for instantiating an array (`ndarray(...)`). For more information, refer to the `numpy` module and examine the the methods and attributes of an array. Attributes ---------- T : ndarray Transponent of the array. data : buffer Array data in memory. dtype : data type Data type, describing the format of the elements in the array. flags : dict Dictionary containing information related to memory use, e.g., 'C_CONTIGUOUS', 'OWNDATA', 'WRITEABLE', and others. flat : ndarray Return flattened version of the array as an iterator. The iterator allows assignments, e.g., ``x.flat = 3``. imag : ndarray Imaginary part of the array. real : ndarray Real part of the array. size : int Number of elements in the array. itemsize : int The size of each element in memory (in bytes). nbytes : int The total number of bytes required to store the array data, i.e., ``itemsize * size``. shape : tuple of ints Shape of the array. strides : tuple of ints The step-size required to move from one element to the next in memory. For example, a contiguous ``(3, 4)`` array of type ``int16`` in C-order has strides ``(8, 2)``. This implies that to move from element to element in memory requires jumps of 2 bytes. To move from row-to-row, one needs to jump 6 bytes at a time (``2 * 4``). ctypes : ctypes object Class containing properties of the array needed for interaction with ctypes. base : ndarray If the array is a view on another array, that array is its `base` (unless that array is also a view). The `base` array is where the array data is ultimately stored. Parameters ---------- shape : tuple of ints Shape of created array. dtype : data type, optional Any object that can be interpreted a numpy data type. buffer : object exposing buffer interface, optional Used to fill the array with data. offset : int, optional Offset of array data in buffer. strides : tuple of ints, optional Strides of data in memory. order : {'C', 'F'}, optional Row-major or column-major order. See Also -------- array : Construct an array. zeros : Create an array and fill its allocated memory with zeros. empty : Create an array, but leave its allocated memory unchanged. dtype : Create a data type. Notes ----- There are two modes of creating an array using __new__: 1. If `buffer` is None, then only `shape`, `dtype`, and `order` are used. 2. If `buffer` is an object exporting the buffer interface, then all keywords are interpreted. No __init__ method is needed because the array is fully initialized after the __new__ method. Examples -------- These examples illustrate the low-level `ndarray` constructor. Refer to the `See Also` section for easier ways of constructing an ndarray. First mode, `buffer` is None: >>> np.ndarray(shape=(2,2), dtype=float, order='F') array([[ -1.13698227e+002, 4.25087011e-303], [ 2.88528414e-306, 3.27025015e-309]]) Second mode: >>> np.ndarray((2,), buffer=np.array([1,2,3]), ... offset=np.int_().itemsize, ... dtype=int) # offset = 1*itemsize, i.e. skip first element array([2, 3]) """) ############################################################################## # # ndarray attributes # ############################################################################## add_newdoc('numpy.core.multiarray', 'ndarray', ('__array_interface__', """Array protocol: Python side.""")) add_newdoc('numpy.core.multiarray', 'ndarray', ('__array_finalize__', """None.""")) add_newdoc('numpy.core.multiarray', 'ndarray', ('__array_priority__', """Array priority.""")) add_newdoc('numpy.core.multiarray', 'ndarray', ('__array_struct__', """Array protocol: C-struct side.""")) add_newdoc('numpy.core.multiarray', 'ndarray', ('_as_parameter_', """Allow the array to be interpreted as a ctypes object by returning the data-memory location as an integer """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('base', """ Base object if memory is from some other object. Examples -------- Base of an array owning its memory is None: >>> x = np.array([1,2,3,4]) >>> x.base is None True Slicing creates a view, and the memory is shared with x: >>> y = x[2:] >>> y.base is x True """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('ctypes', """A ctypes interface object. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('data', """Buffer object pointing to the start of the data. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('dtype', """Data-type for the array. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('imag', """ Imaginary part of the array. Examples -------- >>> x = np.sqrt([1+0j, 0+1j]) >>> x.imag array([ 0. , 0.70710678]) >>> x.imag.dtype dtype('float64') """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('itemsize', """ Length of one element in bytes. Examples -------- >>> x = np.array([1,2,3], dtype=np.float64) >>> x.itemsize 8 >>> x = np.array([1,2,3], dtype=np.complex128) >>> x.itemsize 16 """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('flags', """Special object providing array flags. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('flat', """ A 1-d flat iterator. Examples -------- >>> x = np.arange(3*4*5) >>> x.shape = (3,4,5) >>> x.flat[19] 19 >>> x.T.flat[19] 31 """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('nbytes', """ Number of bytes in the array. Examples -------- >>> x = np.zeros((3,5,2), dtype=np.complex128) >>> x.nbytes 480 >>> np.prod(x.shape) * x.itemsize 480 """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('ndim', """ Number of array dimensions. Examples -------- >>> x = np.array([1,2,3]) >>> x.ndim 1 >>> y = np.zeros((2,3,4)) >>> y.ndim 3 """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('real', """ Real part of the array. Examples -------- >>> x = np.sqrt([1+0j, 0+1j]) >>> x.real array([ 1. , 0.70710678]) >>> x.real.dtype dtype('float64') """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('shape', """ Tuple of array dimensions. Examples -------- >>> x = np.array([1,2,3,4]) >>> x.shape (4,) >>> y = np.zeros((4,5,6)) >>> y.shape (4, 5, 6) >>> y.shape = (2, 5, 2, 3, 2) >>> y.shape (2, 5, 2, 3, 2) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('size', """ Number of elements in the array. Examples -------- >>> x = np.zeros((3,5,2), dtype=np.complex128) >>> x.size 30 """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('strides', """ Tuple of bytes to step in each dimension. The byte offset of element ``(i[0], i[1], ..., i[n])`` in an array `a` is:: offset = sum(np.array(i) * a.strides) Examples -------- >>> x = np.reshape(np.arange(5*6*7*8), (5,6,7,8)).transpose(2,3,1,0) >>> x.strides (32, 4, 224, 1344) >>> i = np.array([3,5,2,2]) >>> offset = sum(i * x.strides) >>> x[3,5,2,2] 813 >>> offset / x.itemsize 813 """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('T', """ Same as self.transpose() except self is returned for self.ndim < 2. Examples -------- >>> x = np.array([[1.,2.],[3.,4.]]) >>> x.T array([[ 1., 3.], [ 2., 4.]]) """)) ############################################################################## # # ndarray methods # ############################################################################## add_newdoc('numpy.core.multiarray', 'ndarray', ('__array__', """ a.__array__(|dtype) -> reference if type unchanged, copy otherwise. Returns either a new reference to self if dtype is not given or a new array of provided data type if dtype is different from the current dtype of the array. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('__array_wrap__', """a.__array_wrap__(obj) -> Object of same type as a from ndarray obj. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('__copy__', """a.__copy__([order]) Return a copy of the array. Parameters ---------- order : {'C', 'F', 'A'}, optional If order is 'C' (False) then the result is contiguous (default). If order is 'Fortran' (True) then the result has fortran order. If order is 'Any' (None) then the result has fortran order only if the array already is in fortran order. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('__deepcopy__', """a.__deepcopy__() -> Deep copy of array. Used if copy.deepcopy is called on an array. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('__reduce__', """a.__reduce__() For pickling. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('__setstate__', """a.__setstate__(version, shape, dtype, isfortran, rawdata) For unpickling. Parameters ---------- version : int optional pickle version. If omitted defaults to 0. shape : tuple dtype : data-type isFortran : bool rawdata : string or list a binary string with the data (or a list if 'a' is an object array) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('all', """ a.all(axis=None, out=None) Check if all of the elements of `a` are true. Refer to `numpy.all` for full documentation. See Also -------- numpy.all : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('any', """ a.any(axis=None, out=None) Check if any of the elements of `a` are true. Refer to `numpy.any` for full documentation. See Also -------- numpy.any : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('argmax', """ a.argmax(axis=None, out=None) Return indices of the maximum values along the given axis of `a`. Parameters ---------- axis : int, optional Axis along which to operate. By default flattened input is used. out : ndarray, optional Alternative output array in which to place the result. Must be of the same shape and buffer length as the expected output. Returns ------- index_array : {ndarray, int} An array of indices or single index value, or a reference to `out` if it was specified. Examples -------- >>> a = np.arange(6).reshape(2,3) >>> a.argmax() 5 >>> a.argmax(0) array([1, 1, 1]) >>> a.argmax(1) array([2, 2]) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('argmin', """ a.argmin(axis=None, out=None) Return indices of the minimum values along the given axis of `a`. Refer to `numpy.ndarray.argmax` for detailed documentation. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('argsort', """ a.argsort(axis=-1, kind='quicksort', order=None) Returns the indices that would sort this array. Refer to `numpy.argsort` for full documentation. See Also -------- numpy.argsort : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('astype', """ a.astype(t) Copy of the array, cast to a specified type. Parameters ---------- t : string or dtype Typecode or data-type to which the array is cast. Examples -------- >>> x = np.array([1, 2, 2.5]) >>> x array([ 1. , 2. , 2.5]) >>> x.astype(int) array([1, 2, 2]) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('byteswap', """a.byteswap(False) -> View or copy. Swap the bytes in the array. Swap the bytes in the array. Return the byteswapped array. If the first argument is True, byteswap in-place and return a reference to self. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('choose', """ a.choose(choices, out=None, mode='raise') Use an index array to construct a new array from a set of choices. Refer to `numpy.choose` for full documentation. See Also -------- numpy.choose : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('clip', """ a.clip(a_min, a_max, out=None) Return an array whose values are limited to ``[a_min, a_max]``. Refer to `numpy.clip` for full documentation. See Also -------- numpy.clip : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('compress', """ a.compress(condition, axis=None, out=None) Return selected slices of this array along given axis. Refer to `numpy.compress` for full documentation. See Also -------- numpy.compress : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('conj', """a.conj() Return an array with all complex-valued elements conjugated. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('conjugate', """a.conjugate() Return an array with all complex-valued elements conjugated. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('copy', """ a.copy([order]) Return a copy of the array. Parameters ---------- order : {'C', 'F', 'A'}, optional By default, the result is stored in C-contiguous (row-major) order in memory. If `order` is `F`, the result has 'Fortran' (column-major) order. If order is 'A' ('Any'), then the result has the same order as the input. Examples -------- >>> x = np.array([[1,2,3],[4,5,6]], order='F') >>> y = x.copy() >>> x.fill(0) >>> x array([[0, 0, 0], [0, 0, 0]]) >>> y array([[1, 2, 3], [4, 5, 6]]) >>> y.flags['C_CONTIGUOUS'] True """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('cumprod', """ a.cumprod(axis=None, dtype=None, out=None) Return the cumulative product of the elements along the given axis. Refer to `numpy.cumprod` for full documentation. See Also -------- numpy.cumprod : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('cumsum', """ a.cumsum(axis=None, dtype=None, out=None) Return the cumulative sum of the elements along the given axis. Refer to `numpy.cumsum` for full documentation. See Also -------- numpy.cumsum : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('diagonal', """ a.diagonal(offset=0, axis1=0, axis2=1) Return specified diagonals. Refer to `numpy.diagonal` for full documentation. See Also -------- numpy.diagonal : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('dump', """a.dump(file) Dump a pickle of the array to the specified file. The array can be read back with pickle.load or numpy.load. Parameters ---------- file : str A string naming the dump file. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('dumps', """a.dumps() Returns the pickle of the array as a string. pickle.loads or numpy.loads will convert the string back to an array. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('fill', """ a.fill(value) Fill the array with a scalar value. Parameters ---------- a : ndarray Input array value : scalar All elements of `a` will be assigned this value. Returns ------- None Examples -------- >>> a = np.array([1, 2]) >>> a.fill(0) >>> a array([0, 0]) >>> a = np.empty(2) >>> a.fill(1) >>> a array([ 1., 1.]) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('flatten', """ a.flatten(order='C') Collapse an array into one dimension. Parameters ---------- order : {'C', 'F'}, optional Whether to flatten in C (row-major) or Fortran (column-major) order. The default is 'C'. Returns ------- y : ndarray A copy of the input array, flattened to one dimension. Examples -------- >>> a = np.array([[1,2], [3,4]]) >>> a.flatten() array([1, 2, 3, 4]) >>> a.flatten('F') array([1, 3, 2, 4]) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('getfield', """a.getfield(dtype, offset) Returns a field of the given array as a certain type. A field is a view of the array data with each itemsize determined by the given type and the offset into the current array. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('item', """a.item() Copy the first element of array to a standard Python scalar and return it. The array must be of size one. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('max', """ a.max(axis=None, out=None) Return the maximum along a given axis. Refer to `numpy.amax` for full documentation. See Also -------- numpy.amax : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('mean', """ a.mean(axis=None, dtype=None, out=None) Returns the average of the array elements along given axis. Refer to `numpy.mean` for full documentation. See Also -------- numpy.mean : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('min', """ a.min(axis=None, out=None) Return the minimum along a given axis. Refer to `numpy.amin` for full documentation. See Also -------- numpy.amin : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('newbyteorder', """a.newbyteorder(byteorder) Equivalent to a.view(a.dtype.newbytorder(byteorder)) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('nonzero', """ a.nonzero() Return the indices of the elements of a which are not zero. Refer to `numpy.nonzero` for full documentation. See Also -------- numpy.nonzero : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('prod', """ a.prod(axis=None, dtype=None, out=None) Return the product of the array elements over the given axis Refer to `numpy.prod` for full documentation. See Also -------- numpy.prod : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('ptp', """ a.ptp(axis=None, out=None) Peak to peak (maximum - minimum) value along a given axis. Refer to `numpy.ptp` for full documentation. See Also -------- numpy.ptp : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('put', """ a.put(indices, values, mode='raise') Set a.flat[n] = values[n] for all n in indices. Refer to `numpy.put` for full documentation. See Also -------- numpy.put : equivalent function """)) add_newdoc('numpy.core.multiarray', 'putmask', """ putmask(a, mask, values) Sets a.flat[n] = values[n] for each n where mask.flat[n] is true. If `values` is not the same size as `a` and `mask` then it will repeat. This gives behavior different from a[mask] = values. Parameters ---------- a : array_like Array to put data into mask : array_like Boolean mask array values : array_like Values to put See Also -------- put, take Examples -------- >>> a = np.array([10,20,30,40]) >>> mask = np.array([True,False,True,True]) >>> a.putmask([60,70,80,90], mask) >>> a array([60, 20, 80, 90]) >>> a = np.array([10,20,30,40]) >>> a[mask] array([60, 80, 90]) >>> a[mask] = np.array([60,70,80,90]) >>> a array([60, 20, 70, 80]) >>> a.putmask([10,90], mask) >>> a array([10, 20, 10, 90]) >>> np.putmask(a, mask, [60,70,80,90]) """) add_newdoc('numpy.core.multiarray', 'ndarray', ('ravel', """ a.ravel([order]) Return a flattened array. Refer to `numpy.ravel` for full documentation. See Also -------- numpy.ravel : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('repeat', """ a.repeat(repeats, axis=None) Repeat elements of an array. Refer to `numpy.repeat` for full documentation. See Also -------- numpy.repeat : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('reshape', """ a.reshape(shape, order='C') Returns an array containing the data of a, but with a new shape. Refer to `numpy.reshape` for full documentation. See Also -------- numpy.reshape : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('resize', """ a.resize(new_shape, refcheck=True, order=False) Change shape and size of array in-place. Parameters ---------- a : ndarray Input array. new_shape : {tuple, int} Shape of resized array. refcheck : bool, optional If False, memory referencing will not be checked. Default is True. order : bool, optional . Default if False. Returns ------- None Raises ------ ValueError If `a` does not own its own data, or references or views to it exist. Examples -------- Shrinking an array: array is flattened in C-order, resized, and reshaped: >>> a = np.array([[0,1],[2,3]]) >>> a.resize((2,1)) >>> a array([[0], [1]]) Enlarging an array: as above, but missing entries are filled with zeros: >>> b = np.array([[0,1],[2,3]]) >>> b.resize((2,3)) >>> b array([[0, 1, 2], [3, 0, 0]]) Referencing an array prevents resizing: >>> c = a >>> a.resize((1,1)) Traceback (most recent call last): ... ValueError: cannot resize an array that has been referenced ... """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('round', """ a.round(decimals=0, out=None) Return an array rounded a to the given number of decimals. Refer to `numpy.around` for full documentation. See Also -------- numpy.around : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('searchsorted', """ a.searchsorted(v, side='left') Find indices where elements of v should be inserted in a to maintain order. For full documentation, see `numpy.searchsorted` See Also -------- numpy.searchsorted : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('setfield', """m.setfield(value, dtype, offset) -> None. places val into field of the given array defined by the data type and offset. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('setflags', """a.setflags(write=None, align=None, uic=None) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('sort', """ a.sort(axis=-1, kind='quicksort', order=None) Sort an array, in-place. Parameters ---------- axis : integer Axis to be sorted along. None indicates that the flattened array should be used. Default is -1. kind : string Sorting algorithm to use. Possible values are 'quicksort', 'mergesort', or 'heapsort'. Default is 'quicksort'. order : list type or None When a is an array with fields defined, this argument specifies which fields to compare first, second, etc. Not all fields need be specified. See Also -------- argsort : indirect sort lexsort : indirect stable sort on multiple keys searchsorted : find keys in sorted array Notes ----- The various sorts are characterized by average speed, worst case performance, need for work space, and whether they are stable. A stable sort keeps items with the same key in the same relative order. The three available algorithms have the following properties: =========== ======= ============= ============ ======= kind speed worst case work space stable =========== ======= ============= ============ ======= 'quicksort' 1 O(n^2) 0 no 'mergesort' 2 O(n*log(n)) ~n/2 yes 'heapsort' 3 O(n*log(n)) 0 no =========== ======= ============= ============ ======= All the sort algorithms make temporary copies of the data when the sort is not along the last axis. Consequently, sorts along the last axis are faster and use less space than sorts along other axis. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('squeeze', """ a.squeeze() Remove single-dimensional entries from the shape of `a`. Refer to `numpy.squeeze` for full documentation. See Also -------- numpy.squeeze : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('std', """ a.std(axis=None, dtype=None, out=None, ddof=0) Returns the standard deviation of the array elements along given axis. Refer to `numpy.std` for full documentation. See Also -------- numpy.std : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('sum', """ a.sum(axis=None, dtype=None, out=None) Return the sum of the array elements over the given axis. Refer to `numpy.sum` for full documentation. See Also -------- numpy.sum : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('swapaxes', """ a.swapaxes(axis1, axis2) Return a view of the array with `axis1` and `axis2` interchanged. Refer to `numpy.swapaxes` for full documentation. See Also -------- numpy.swapaxes : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('take', """ a.take(indices, axis=None, out=None, mode='raise') Return an array formed from the elements of a at the given indices. Refer to `numpy.take` for full documentation. See Also -------- numpy.take : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('tofile', """a.tofile(fid, sep="", format="%s") Write the data to a file. Data is always written in 'C' order, independently of the order of `a`. The data produced by this method can be recovered by using the function fromfile(). This is a convenience function for quick storage of array data. Information on endianess and precision is lost, so this method is not a good choice for files intended to archive data or transport data between machines with different endianess. Some of these problems can be overcome by outputting the data as text files at the expense of speed and file size. Parameters ---------- fid : file or string An open file object or a string containing a filename. sep : string Separator between array items for text output. If "" (empty), a binary file is written, equivalently to file.write(a.tostring()). format : string Format string for text file output. Each entry in the array is formatted to text by converting it to the closest Python type, and using "format" % item. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('tolist', """ a.tolist() Return the array as a list or nested lists. Parameters ---------- a : ndarray Input array. Returns ------- y : list Copy the data portion of the array to a hierarchical Python list and return that list. Data items are converted to the nearest compatible Python type. Examples -------- >>> a = np.array([1, 2]) >>> a.tolist() [1, 2] >>> a = np.array([[1, 2], [3, 4]]) >>> a.tolist() [[1, 2], [3, 4]] """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('tostring', """a.tostring(order='C') Construct a Python string containing the raw data bytes in the array. Parameters ---------- order : {'C', 'F', None} Order of the data for multidimensional arrays: C, Fortran, or the same as for the original array. """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('trace', """ a.trace(offset=0, axis1=0, axis2=1, dtype=None, out=None) Return the sum along diagonals of the array. Refer to `numpy.trace` for full documentation. See Also -------- numpy.trace : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('transpose', """a.transpose(*axes) Returns a view of 'a' with axes transposed. If no axes are given, or None is passed, switches the order of the axes. For a 2-d array, this is the usual matrix transpose. If axes are given, they describe how the axes are permuted. Examples -------- >>> a = np.array([[1,2],[3,4]]) >>> a array([[1, 2], [3, 4]]) >>> a.transpose() array([[1, 3], [2, 4]]) >>> a.transpose((1,0)) array([[1, 3], [2, 4]]) >>> a.transpose(1,0) array([[1, 3], [2, 4]]) """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('var', """ a.var(axis=None, dtype=None, out=None, ddof=0) Returns the variance of the array elements, along given axis. Refer to `numpy.var` for full documentation. See Also -------- numpy.var : equivalent function """)) add_newdoc('numpy.core.multiarray', 'ndarray', ('view', """ a.view(dtype=None, type=None) New view of array with the same data. Parameters ---------- dtype : data-type Data-type descriptor of the returned view, e.g. float32 or int16. type : python type Type of the returned view, e.g. ndarray or matrix. Examples -------- >>> x = np.array([(1, 2)], dtype=[('a', np.int8), ('b', np.int8)]) Viewing array data using a different type and dtype: >>> y = x.view(dtype=np.int16, type=np.matrix) >>> print y.dtype int16 >>> print type(y) Using a view to convert an array to a record array: >>> z = x.view(np.recarray) >>> z.a array([1], dtype=int8) Views share data: >>> x[0] = (9, 10) >>> z[0] (9, 10) """)) add_newdoc('numpy.core.umath','geterrobj', """geterrobj() Used internally by `geterr`. Returns ------- errobj : list Internal numpy buffer size, error mask, error callback function. """) add_newdoc('numpy.core.umath','seterrobj', """seterrobj() Used internally by `seterr`. Parameters ---------- errobj : list [buffer_size, error_mask, callback_func] See Also -------- seterrcall """) add_newdoc("numpy.core","ufunc", """Functions that operate element by element on whole arrays. Unary ufuncs: ============= op(X, out=None) Apply op to X elementwise Parameters ---------- X : array-like out : array-like An array to store the output. Must be the same shape as X. Returns ------- r : array-like r will have the same shape as X; if out is provided, r will be equal to out. Binary ufuncs: ============== op(X, Y, out=None) Apply op to X and Y elementwise. May "broadcast" to make the shapes of X and Y congruent. The broadcasting rules are: * Dimensions of length 1 may be prepended to either array * Arrays may be repeated along dimensions of length 1 Parameters ---------- X : array-like Y : array-like out : array-like An array to store the output. Must be the same shape as the output would have. Returns ------- r : array-like The return value; if out is provided, r will be equal to out. """) add_newdoc('numpy.core', 'ufunc', ('reduce', """ reduce(array, axis=0, dtype=None, out=None) Reduce applies the operator to all elements of the array. For a one-dimensional array, reduce produces results equivalent to: :: r = op.identity for i in xrange(len(A)): r = op(r,A[i]) return r For example, add.reduce() is equivalent to sum(). Parameters ---------- array : array-like The array to act on. axis : integer The axis along which to apply the reduction. dtype : {data-type-code, None} The type used to represent the intermediate results. Defaults to the data type of the output array if this is provided, or the data type of the input array if no output array is provided. out : {array-like, None} A location into which the result is stored. If not provided a freshly-allocated array is returned. Returns ------- r : {array, scalar} The reduced values. If out was supplied, r is equal to out. Examples -------- >>> np.multiply.reduce([2,3,5]) 30 """)) add_newdoc('numpy.core', 'ufunc', ('accumulate', """ accumulate(array, axis=None, dtype=None, out=None) Accumulate the result of applying the operator to all elements. For a one-dimensional array, accumulate produces results equivalent to: :: r = np.empty(len(A)) t = op.identity for i in xrange(len(A)): t = op(t,A[i]) r[i] = t return r For example, add.accumulate() is equivalent to cumsum(). Parameters ---------- array : array_like The array to act on. axis : int, optional The axis along which to apply the accumulation. dtype : data-type-code, optional The type used to represent the intermediate results. Defaults to the data type of the output array if this is provided, or the data type of the input array if no output array is provided. out : ndarray, optional A location into which the result is stored. If not provided a freshly-allocated array is returned. Returns ------- r : ndarray The accumulated values. If `out` was supplied, `r` is equal to `out`. Examples -------- >>> np.multiply.accumulate([2,3,5]) array([2,6,30]) """)) add_newdoc('numpy.core', 'ufunc', ('reduceat', """ reduceat(self, array, indices, axis=None, dtype=None, out=None) Reduceat performs a reduce with specified slices over an axis. Computes op.reduce(`array[indices[i]:indices[i+1]]`) for i=0..end with an implicit `indices[i+1]` = len(`array`) assumed when i = end - 1. If `indices[i]` >= `indices[i + 1]` then the result is `array[indices[i]]` for that value. The function op.accumulate(`array`) is the same as op.reduceat(`array`, `indices`)[::2] where `indices` is range(len(`array`)-1) with a zero placed in every other sample: `indices` = zeros(len(`array`)*2 - 1) `indices[1::2]` = range(1, len(`array`)) The output shape is based on the size of `indices`. Parameters ---------- array : array_like The array to act on. indices : array_like Paired indices specifying slices to reduce. axis : int, optional The axis along which to apply the reduceat. dtype : data-type-code, optional The type used to represent the intermediate results. Defaults to the data type of the output array if this is provided, or the data type of the input array if no output array is provided. out : ndarray, optional A location into which the result is stored. If not provided a freshly-allocated array is returned. Returns ------- r : array The reduced values. If `out` was supplied, `r` is equal to `out`. Examples -------- To take the running sum of four successive values: >>> np.add.reduceat(np.arange(8),[0,4, 1,5, 2,6, 3,7])[::2] array([ 6, 10, 14, 18]) """)) add_newdoc('numpy.core', 'ufunc', ('outer', """ outer(A,B) Compute the result of applying op to all pairs (a,b) op.outer(A,B) is equivalent to op(A[:,:,...,:,newaxis,...,newaxis]*B[newaxis,...,newaxis,:,...,:]) where A has B.ndim new axes appended and B has A.ndim new axes prepended. For A and B one-dimensional, this is equivalent to :: r = empty(len(A),len(B)) for i in xrange(len(A)): for j in xrange(len(B)): r[i,j] = A[i]*B[j] If A and B are higher-dimensional, the result has dimension A.ndim+B.ndim Parameters ---------- A : array-like First term B : array-like Second term Returns ------- r : array Output array Examples -------- >>> np.multiply.outer([1,2,3],[4,5,6]) array([[ 4, 5, 6], [ 8, 10, 12], [12, 15, 18]]) """))