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realft


Hi,

I'm using realft from NR in fortran 77 to find the fourier transform
of a real data. Can someone tell me how the output is arranged or how
I have arrange it?

many thanks,
garba

On May 14, 9:04 am, garb@gmail.com wrote:

> Hi,

> I'm using realft from NR in fortran 77 to find the fourier transform
> of a real data. Can someone tell me how the output is arranged or how
> I have arrange it?

Have you read the recent thread in this newsgroup "fft from numerical
recipes"? The poster found that the page "IDL and FORTRAN FFT
Comparison" http://cimss.ssec.wisc.edu/~paulv/fft/fft_comparison.html
answered his question.
On May 14, 9:47 am, Beliavsky <beliav@aol.com> wrote:

> On May 14, 9:04 am, garb@gmail.com wrote:

> > Hi,

> > I'm using realft from NR in fortran 77 to find the fourier transform
> > of a real data. Can someone tell me how the output is arranged or how
> > I have arrange it?

> Have you read the recent thread in this newsgroup "fft from numerical
> recipes"? The poster found that the page "IDL and FORTRAN FFT
> Comparison"http://cimss.ssec.wisc.edu/~paulv/fft/fft_comparison.html
> answered his question.

Yes, I read that conversation repeatedly but still I'm missing
something. What I actually wanted to do is to find the hilbert
transform and when I plot my result, I'm getting is a kind of double
plot. The shape is similar but a little bit displaced and the data
points jump from a point in one of the plots to a point in the other
plot. Does it have anything to do with the Nyquist frequency?

thanks,
garba

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