[SciPy-User] rfft

[garyr]

----- Original Message ----- 
From: "Charles R Harris" <charlesr.harris at gmail.com>
To: "SciPy Users List" <scipy-user at scipy.org>
Sent: Monday, June 20, 2011 8:11 AM
Subject: Re: [SciPy-User] rfft


> 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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