[SciPy-User] rfft

[Charles R Harris]

On Mon, Jun 20, 2011 at 9:03 AM, garyr <garyr at fidalgo.net> wrote:

> If I generate a sine wave of a particular frequency in an array of type
> float32 or float64 and compute the transform using the function fft (in
> scipy/fftpack/basic.py) I find the signal in the correct bin. If I use the
> function rfft, which is described as returning the Fourier transform of a
> real sequence,  I find the signal in the bin corresponding to twice the
> actual frequency. I thought rfft would be the proper function to use for
> real (non-complex) data. What is the correct usage of rfft?
>
>
Could you provide an example?

Chuck
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