Hi SangHyuk On 30.05.2016 14:25, SangHyuk Kim wrote: > Hi all, > > The file, /gr-fft/lib/fft_vcc_fftw.cc(http://goo.gl/X8WNPh), No need to use URL shorteners in Emails. Why are you using a revision of that file from 2012? That is not what you should do. Select "branch: Master" from the drop-down menu; you should be looking at http://gnuradio.org/redmine/projects/gnuradio/repository/entry/gr-fft/lib/fft_vcc_fftw.cc?rev=master . Reading versions of code that no-one uses anymore doesn't help you !
> I can understand how get inputs to 'd_fft', but I don't know about d_fft->execute() that compute the fft. So, here's how you approach something like this: Find out what "d_fft" is. For that, you often need to look in the .h file to your .cc. There you'll find out which class type d_fft has. Find that type's definition. Or, you could just go to and search for "execute" in the search box. That'll tell you the classes that have a method called "execute", and you can access the documentation to these. > I can't find its' implementation in anywhere so that I can't > understand what happen in this function. A DFT is performed, by calling the fftwf_execute function of the FFTw library, which really, just executes a fast DFT. Best regards, Marcus
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