Antoine Pitrou <solip...@pitrou.net> wrote: > Can you define "expensive"?
Slow enough to cause complaints on the Cython mailing list. > You're assuming this is the cost of "buffer acquisition", while most > likely it's the cost of creating the memoryview object itself. Constructing a typed memoryview from a typed memoryview or a slice is fast. Numerical code doing this intensively is still within 80-90% of the speed of plain c code using pointer arithmetics. > Buffer acquisition itself only calls a single C callback and uses a > stack-allocated C structure. It shouldn't be "expensive". I don't know the reason, only that buffer acquisition from NumPy arrays with typed memoryviews is very expensive compared to assigning a typed memoryview to another or slicing a typed memoryview. Sturla _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org https://mail.scipy.org/mailman/listinfo/numpy-discussion
