Simple Interpolation in Numpy?

[Nick Bower]

How do I do do simple interpolation using NumPy?  I can see an
interpolation function in the NumPy C source, so I'm not sure why it's
not presented at the Python module level.

My very basic need it to re-sample/shift 1D spectral data.  But since
it's so large (3e6 doubles), doing it in Python is not
feasible/sensible.  A lower-level solution is required, and I was hoping
it would be provided by Numpy.  Perhaps not?

Thanks for any help, Nick.