On Mar 15, 2005, at 1:18 PM, Ralf Juengling wrote:
konrad.hinsen@laposte.net wrote:
How much do you expect to gain compared to a Python loop in such a case?
I'd expect a factor 5 to 10.
How did you come to that conclusion? It's not at all clear to me that the overhead of the Python operation (i.e., calling the appropriate Python method or function from C) will add appreciably to the time it takes to call it from C. Remember, the speed of the C version of the Python function may have much more overhead than what you envision for an equivalent C function that you would write. So it isn't good enough to compare the speed of a python loop to the C code to do sum and dot that you would write. Adding these to the API is extra work, and worse, it perhaps risks making it harder to change the internals since so much more of what is in C is exposed. The current API is essentially centered around exposing the data and means of converting and copying the data, and to a lesser extent, building new UFuncs (for use at the Python level). Perry