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

I believe you can do this by iterating over the python list of floats and putting them in a C array.

cimport cython
from libc.stdlib cimport malloc, free

cdef:
    float * cfloats
    int i

cfloats =  malloc(len(pyfloats)*cython.sizeof(float))
if cfloats is NULL:
  raise MemoryError()
for i in xrange(len(pyfloats)):
  cfloats[i] = pyfloats[i]
setOverlays(cfloats)
free(cfloats)