12.10.2014, 22:16, Eric Firing kirjoitti: > On 2014/10/12, 8:29 AM, Pauli Virtanen wrote: >> 12.10.2014, 20:19, Mads Ipsen kirjoitti: >>> Is there any way for me to detect (on the Python side) that transpose() >>> has been invoked on the matrix, and thereby only do the copy operation >>> when it really is needed? >> >> The correct way to do this is to, either: >> >> In your C code check PyArray_IS_C_CONTIGUOUS(obj) and raise an error if >> it is not. In addition, on the Python side, check for >> `a.flags.c_contiguous` and make a copy if it is not. >> >> OR >> >> In your C code, get an handle to the array using PyArray_FromANY (or >> PyArray_FromOTF) with NPY_ARRAY_C_CONTIGUOUS requirement set so that it >> makes a copy when necessary. > > or let numpy handle it on the python side: > > foo(numpy.ascontiguousarray(a))
Yes, but the C code really should check that the input array is C-contiguous, if it only works for C-contiguous inputs. -- Pauli Virtanen _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
