Numpy records in the c api

Question

I'm playing with writing some C code to speed up an inner loop in my python code. This loop operates on a numpy record, e.g. soemthing like this:

a = numpy.zeros((10,), dtype=[("myfvalue" ,"float"), ("myc", "int8"),
                              ("anotheri", "uint64")])

which is then passed into c code like so:

myCFunc(a, "blah")

I was wondering if someone had an example of how to access particular columns of "a" in the C func. Clearly, this is going to involve a PyArray_Descr.fields somewhere, but an example would really help make things clearer for me.

Answer 1

There are a number of examples on the Scipy Wiki:

• C Extensions to NumPy and Python