Re: [Discuss-gnuradio] how to use FFT without grc block

[Marcus Müller]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi Nasi,
On 24.01.2014 02:45, Nasi wrote:
> Thanks!
> 
> with doxygen docs do you mean these:
> http://gnuradio.org/doc/doxygen/classgr_1_1fft_1_1fft__complex.html
> ?
Yes, basically that class. I was referring to the module as whole, and
was hoping you'd might take a look into the GR source to find out how
it works; really, no magic involved there :) look into gr-fft/lib/fft.cc

> this redundant information is hopeless...
> 
> Do you know any normal good mature documentation?
Well if you want to use gr-fft, you must me content with what you can
find in the doxygen, find when searching the mailing list and the
internet in general. This is open source, so when someone implemented
something and felt that it is documented well enough, they'd stop
writing documentation and continue on implementing cool stuff :)
basically, the names of the methods fft_complex class seem to named
self-explanatory enough to me...

I *do* get the feeling you're not really after the minimalist fft
wrapper classes that are available in gr-fft, but want some general
FFT routines. As explained in great length in my last email, look for
a general FFT library then, and FFTW is the library of choice and
well-documented.

Anyway, you should explain what you're trying to do and maybe we can
help you :)

Good morning!
Marcus

> 
> 
> 
> Четверг, 23 января 2014, 20:57 +01:00 от Marcus Müller
> <address@hidden>: Yes, you can. Look into the gr-fft module
> documentation in the doxygen docs. Alternatively, you can simply
> link against FFTW [1] yourself and use the FFT algorithms; gr-fft
> is a wrapper for that functionality offering simplification and
> ease of use. But if an FFT is all that you're after, going directly
> for FFTW might be the best choice; if you need something
> non-standard such as 2D-FFT (or higher dimensions), real-only
> transforms, sliced/strided, hundreds of transforms at once... use
> FFTW. If you just want an N-Point FFT and are linking against GR
> anyway, use gr-fft.
> 
> Greetings, Marcus
> 
> [1] Fastest Fourier Transform in the West,  http://www.fftw.org/
> 
> On 23.01.2014 20:17, Nasi wrote:
>>>> Hi all,
>>>> 
>>>> I know there is an FFT block in gnuradio 3.7. I want to
>>>> create a cc file and add some gnuradio classes there. Can I
>>>> use FFT without .grc file without using blocks, just as a c++
>>>> function?
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> _______________________________________________
>>>> Discuss-gnuradio mailing list  address@hidden 
>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>> 
>> 
>> _______________________________________________ Discuss-gnuradio
>> mailing list address@hidden 
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
> 
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/

iQEcBAEBAgAGBQJS4ghsAAoJEAFxB7BbsDrL2DkH/ijaxBZWxt4gh790z6jc7o4I
63rgJa+J1N9uB78p7ZLuoPaFezmX69VOFLUaC0Az+Sg5hPdXwxE21qOzDNpc+XO2
tA6146LJRZXMjOcrPnkT+gVVxfhx2UklfYPPuxl+ttlAMnrgvh7kK6ZWX5Kzvli8
EhZWdRxl1k4fdxDkKPP8v6kN2pVydWvXpTLwln8FAjkSCsPKXnH7rxfNLJcQZ6vW
WDinaN5chPLYP8hRgTetvB3V06BeDdMB96Kx3n5rmUloOWlCUvLFQ/rLhTUJ84iH
5rjhtTMT/I/3KsmIxYUCUEFhg088p6qNzdmMPEaWL9n+EKxp/t/JuzzYckhIeBQ=
=5nqS
-----END PGP SIGNATURE-----