Re: octave -fourier series coefficients question

[Sergei Steshenko]

----- Original Message -----
> From: James Sherman Jr. <address@hidden>
> To: semih soykan <address@hidden>
> Cc: address@hidden
> Sent: Wednesday, March 27, 2013 11:06 PM
> Subject: Re: octave -fourier series coefficients question
> 
> On Wed, Mar 27, 2013 at 4:46 PM, semih soykan
> <address@hidden> wrote:
>>  hi all.
>>  I am a total newbie in octave,
>>  I ve looked for a default method which will take a signal in N-by-1 vector
>>  and return fourier series coefficients in same format. but i couldn't 
> found
>>  . is there any default method for this? if not what should be a valid
>>  algorithm for this? any help is appreciated.
>> 
>>  and as i said i am a newbie about all octave technology but it seem i ll
>>  need to dig octave and signal processing for a while, as a mentor what do
>>  you suggest me? which tutorial should i follow and what should be my way to
>>  handle all?
>> 
>> 
>> 
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> 
> The standard method for finding the discrete fourier transform is
> Cooley–Tukey algorithm
> (http://en.wikipedia.org/wiki/Cooley%E2%80%93Tukey_FFT_algorithm).
> I'm not a hundred percent sure this is how octave does it,

Octave uses FFTW (visit fftw.org for details) internally.

Octave also uses scaling so that FFT is invertible also WRT amplitude.

Try 'help fft', 'help ifft' from Octave prompt.

> and I don't
> have Octave available right now (but if you type "edit fft.m" you
> could get it, but I'm pretty sure its a precompiled function), but if
> you're interested, its a start.
> 
> Or, are you asking what function in Octave does this?  Thats an easy
> answer: fft.  Type "help fft" for useage.
> 
> James Sherman

Regards,
  Sergei.