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Diffstat (limited to 'doc/release/1.9.0-notes.rst')
| -rw-r--r-- | doc/release/1.9.0-notes.rst | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/doc/release/1.9.0-notes.rst b/doc/release/1.9.0-notes.rst index c00f7f9d6..37343ec6d 100644 --- a/doc/release/1.9.0-notes.rst +++ b/doc/release/1.9.0-notes.rst @@ -6,8 +6,6 @@ This release supports Python 2.6 - 2.7 and 3.2 - 3.4. Highlights ========== -* Addition of `__numpy_ufunc__` to allow overriding ufuncs in ndarray - subclasses. * Numerous performance improvements in various areas, most notably indexing and operations on small arrays are significantly faster. Indexing operations now also release the GIL. @@ -35,6 +33,8 @@ Future Changes * String version checks will break because, e.g., '1.9' > '1.10' is True. A NumpyVersion class has been added that can be used for such comparisons. * The diagonal and diag functions will return writeable views in 1.10.0 +* The `S` and/or `a` dtypes may be changed to represent Python strings + instead of bytes, in Python 3 these two types are very different. Compatibility notes @@ -176,6 +176,11 @@ introduced in advanced indexing operations: * Indexing with more then one ellipsis (``...``) is deprecated. +Non-integer reduction axis indexes are deprecated +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Non-integer axis indexes to reduction ufuncs like `add.reduce` or `sum` are +deprecated. + ``promote_types`` and string dtype ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``promote_types`` function now returns a valid string length when given an @@ -262,13 +267,6 @@ ufunc reductions do since 1.7. One can now say axis=(index, index) to pick a list of axes for the reduction. The ``keepdims`` keyword argument was also added to allow convenient broadcasting to arrays of the original shape. -Ufunc and Dot Overrides -~~~~~~~~~~~~~~~~~~~~~~~ -For better compatibility with external objects you can now override -universal functions (ufuncs), ``numpy.core._dotblas.dot``, and -``numpy.core.multiarray.dot`` (the numpy.dot functions). By defining a -``__numpy_ufunc__`` method. - Dtype parameter added to ``np.linspace`` and ``np.logspace`` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The returned data type from the ``linspace`` and ``logspace`` functions can @@ -336,6 +334,12 @@ in either an error being raised, or wrong results computed. Improvements ============ +Better numerical stability for sum in some cases +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Pairwise summation is now used in the sum method, but only along the fast +axis and for groups of the values <= 8192 in length. This should also +improve the accuracy of var and std in some common cases. + Percentile implemented in terms of ``np.partition`` ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ``np.percentile`` has been implemented in terms of ``np.partition`` which |