>> I'm trying to write an extension module in C which contains a single >> function with the following prototype: >> void func( int N, int * arg1, int * arg2, int * ret ); >> Here arg1 and arg2 are length N arrays, and the function computes ret >> which is also an N length array. From python I'd like to call this >> function as >> ret = func( [ 1, 2, 3 ], [ 2, 3, 4] ) > > This requirement pretty much dictates the slow answer you have.
I'm not sure I understand what you mean. > > Does this mean that I can only pass the arrays from python to C as > > generic python objects and in a later operation I need to get the > > elements from this generic python object, construct a C array and pass > > that to the C function? ... What's the simplest way of doing this? > > Either use ctypes, look into array.array, or look into numpy.array. I have considered using ctypes but for my needs using the C API directly seems more reasonable. array.array and numpy.array doesn't fit my needs since I need to do long and complicated operations on the two (pretty large) integer arrays that would be too slow using array.array and numpy.array (I've verified this claim by benchmarking a numpy.array based solution). > I'd just use numpy, myself: > import numpy > total = numpy.array([1, 2, 3]) + numpy.array([2, 3, 4]) What makes you think I want to add two arrays? Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
