Passing 3-dimensional numpy array to C

Question

I\'m writing a C extension to my Python program for speed purposes, and running into some very strange behaviour trying to pass in a 3-dimensional numpy array. It works with a 2

Answer 1

Rather than converting to a c-style array, I usually access numpy array elements directly using PyArray_GETPTR (see http://docs.scipy.org/doc/numpy/reference/c-api.array.html#data-access).

For instance, to access an element of a 3-dimensional numpy array of type double use double elem=*((double *)PyArray_GETPTR3(list3_obj,i,j,k)).

For your application, you could detect the correct number of dimensions for each array using PyArray_NDIM, then access elements using the appropriate version of PyArray_GETPTR.