How to convert python array to cython array?

Question

I have an array of float values that is created in regular Python, that I want to pass to a cython function that fronts for an underlying C function. The C function requires

Answer 1

This is what I use for preparing arrays for passing to Cython, or C/CPP with SWIG.

import numpy as np    
def make_c_array(a):
    """
    Take an input numpy array and convert to being ready for use in C.
    """
    b = []
    for i in range(len(a)):
        b.append(a[i])
    a = np.array(b,dtype=np.dtype('d'),order='C')
    return a