Would it be okay to add an argument to ctypeslib.as_array() that allowed
specifying that a pointer references column-major memory layout?
Currently if we use ndarray.ctypes.data_as() to get a pointer to a
Fortran-ordered array and then we use ctypeslib.as_array() to read that same
array back in, we don't have a way of doing the round trip correctly.
For example:
>>> import ctypes as ct
>>> a = np.arange(6).reshape(2,3)
>>> a = np.asfortranarray(a)
>>> a
array([[0, 1, 2],
[3, 4, 5]])
>>> a_ptr = a.ctypes.data_as(ct.POINTER(ct.c_int))
>>> b = np.ctypeslib.as_array(a_ptr, shape=a.shape)
>>> b
array([[0, 3, 1],
[4, 2, 5]])
The proposed function signature would be something like:
numpy.ctypeslib.as_array(obj, shape=None, order='None'), with order{‘C’, ‘F’},
optional
Thanks,
Monte
_______________________________________________
NumPy-Discussion mailing list -- [email protected]
To unsubscribe send an email to [email protected]
https://mail.python.org/mailman3/lists/numpy-discussion.python.org/
Member address: [email protected]
