diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/source/user/c-info.ufunc-tutorial.rst | 71 |
1 files changed, 50 insertions, 21 deletions
diff --git a/doc/source/user/c-info.ufunc-tutorial.rst b/doc/source/user/c-info.ufunc-tutorial.rst index 7d6e3f579..0b47dbb9c 100644 --- a/doc/source/user/c-info.ufunc-tutorial.rst +++ b/doc/source/user/c-info.ufunc-tutorial.rst @@ -139,7 +139,7 @@ the module. /* This initiates the module using the above definitions. */ #if PY_VERSION_HEX >= 0x03000000 static struct PyModuleDef moduledef = { - PyModuleDef HEAT_INIT, + PyModuleDef_HEAD_INIT, "spam", NULL, -1, @@ -150,7 +150,7 @@ the module. NULL }; - PyObject *PyInit__npspam(void) + PyObject *PyInit_npspam(void) { PyObject *m; m = PyModule_Create(&moduledef); @@ -182,10 +182,15 @@ directory. setup.py file for spammodule.c Calling + $python setup.py build_ext --inplace + will build the extension library in the current file. + + Calling $python setup.py build - will build the extension library in a file - that looks like ./build/lib*, where lib* is - a file that begins with lib. + will build a file that looks like ./build/lib*, where + lib* is a file that begins with lib. The library will + be in this file and end with a C library extension, + such as .so Calling $python setup.py install @@ -211,11 +216,25 @@ directory. Once the spam module is imported into python, you can call logit via spam.logit. Note that the function used above cannot be applied as-is to numpy arrays. To do so we must call numpy.vectorize on it. -For example: +For example, if a python interpreter is opened in the file containing +the spam library or spam has been installed, one can perform the +following commands: >>> import numpy as np >>> import spam +>>> spam.logit(0) +-inf +>>> spam.logit(1) +inf +>>> spam.logit(0.5) +0.0 +>>> x = np.linspace(0,1,10) +>>> spam.logit(x) +TypeError: only length-1 arrays can be converted to Python scalars >>> f = np.vectorize(spam.logit) +>>> f(x) +array([ -inf, -2.07944154, -1.25276297, -0.69314718, -0.22314355, + 0.22314355, 0.69314718, 1.25276297, 2.07944154, inf]) THE RESULTING LOGIT FUNCTION IS NOT FAST! numpy.vectorize simply loops over spam.logit. The loop is done at the C level, but the numpy @@ -305,7 +324,7 @@ the primary thing that must be changed to create your own ufunc. #if PY_VERSION_HEX >= 0x03000000 static struct PyModuleDef moduledef = { - PyModuleDef HEAT_INIT, + PyModuleDef_HEAD_INIT, "npspam", NULL, -1, @@ -316,9 +335,9 @@ the primary thing that must be changed to create your own ufunc. NULL }; - PyObject *PyInit__npspam(void) + PyObject *PyInit_npspam(void) { - PyObject *m; + PyObject *m, *logit, *d; m = PyModule_Create(&moduledef); if (!m) { return NULL; @@ -376,10 +395,15 @@ or installed to site-packages via python setup.py install. distutils from the python standard library. Calling + $python setup.py build_ext --inplace + will build the extension library in the current file. + + Calling $python setup.py build - will build the extension library in a file - that looks like ./build/lib*, where lib* is - a file that begins with lib. + will build a file that looks like ./build/lib*, where + lib* is a file that begins with lib. The library will + be in this file and end with a C library extension, + such as .so Calling $python setup.py install @@ -579,7 +603,7 @@ the primary thing that must be changed to create your own ufunc. #if PY_VERSION_HEX >= 0x03000000 static struct PyModuleDef moduledef = { - PyModuleDef HEAT_INIT, + PyModuleDef_HEAD_INIT, "npspam", NULL, -1, @@ -590,9 +614,9 @@ the primary thing that must be changed to create your own ufunc. NULL }; - PyObject *PyInit__npspam(void) + PyObject *PyInit_npspam(void) { - PyObject *m; + PyObject *m, *logit, *d; m = PyModule_Create(&moduledef); if (!m) { return NULL; @@ -650,10 +674,15 @@ or installed to site-packages via python setup.py install. distutils from the python standard library. Calling + $python setup.py build_ext --inplace + will build the extension library in the current file. + + Calling $python setup.py build - will build the extension library in a file - that looks like ./build/lib*, where lib* is - a file that begins with lib. + will build a file that looks like ./build/lib*, where + lib* is a file that begins with lib. The library will + be in this file and end with a C library extension, + such as .so Calling $python setup.py install @@ -797,7 +826,7 @@ as well as all other properties of a ufunc. #if PY_VERSION_HEX >= 0x03000000 static struct PyModuleDef moduledef = { - PyModuleDef HEAT_INIT, + PyModuleDef_HEAD_INIT, "npspam", NULL, -1, @@ -808,9 +837,9 @@ as well as all other properties of a ufunc. NULL }; - PyObject *PyInit__npspam(void) + PyObject *PyInit_npspam(void) { - PyObject *m; + PyObject *m, *logit, *d; m = PyModule_Create(&moduledef); if (!m) { return NULL; |