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| import numpy as np | |
| import scipy.linalg.blas | |
| cdef extern from "f2pyptr.h": | |
| void *f2py_pointer(object) except NULL | |
| ctypedef int dgemm_t( | |
| char *transa, char *transb, | |
| int *m, int *n, int *k, | |
| double *alpha, | |
| double *a, int *lda, | |
| double *b, int *ldb, | |
| double *beta, | |
| double *c, int *ldc) | |
| # Since Scipy >= 0.12.0 | |
| cdef dgemm_t *dgemm = <dgemm_t*>f2py_pointer(scipy.linalg.blas.dgemm._cpointer) | |
| def myfunc(): | |
| cdef double[::1,:] a, b, c | |
| cdef int m, n, k, lda, ldb, ldc | |
| cdef double alpha, beta | |
| a = np.array([[1, 2], [3, 4]], float, order="F") | |
| b = np.array([[5, 6], [7, 8]], float, order="F") | |
| c = np.empty((2, 2), float, order="F") | |
| alpha = 1.0 | |
| beta = 0.0 | |
| lda = 2 | |
| ldb = 2 | |
| ldc = 2 | |
| m = 2 | |
| n = 2 | |
| k = 2 | |
| dgemm("N", "N", &m, &n, &k, &alpha, &a[0,0], &lda, &b[0,0], &ldb, &beta, &c[0,0], &ldc) | |
| print(np.asarray(c)) | |
| print(np.dot(a, b)) |
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| #ifndef F2PYPTR_H_ | |
| #define F2PYPTR_H_ | |
| #include <Python.h> | |
| void *f2py_pointer(PyObject *obj) | |
| { | |
| #if PY_VERSION_HEX < 0x03000000 | |
| if (PyCObject_Check(obj)) { | |
| return PyCObject_AsVoidPtr(obj); | |
| } | |
| #endif | |
| #if PY_VERSION_HEX >= 0x02070000 | |
| if (PyCapsule_CheckExact(obj)) { | |
| return PyCapsule_GetPointer(obj, NULL); | |
| } | |
| #endif | |
| PyErr_SetString(PyExc_ValueError, "Not an object containing a void ptr"); | |
| return NULL; | |
| } | |
| #endif |
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