[Numpy-discussion] Detect if array has been transposed
Pauli Virtanen
pav at iki.fi
Sun Oct 12 14:29:24 EDT 2014
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.
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