Re: [Discuss-gnuradio] any possible change in gr.fft_vcc from earlier versions?!

[Alex Dusowitz]

I think it was my mistake somehow, I used hexdump to see the values of the FFT results and seemed like the differences were in the LSB digits and hence different rounding perhaps. I was running the two code on two different laptops, although entirely identical in terms of hardware spec, ubuntu and gnuradio installation and I was expecting them to produce identical results as well. Running the two codes on the same machine with two different gnuradio versions produced identical FFT results. So I guess this case is closed. 

And thanks for adding me to the reporters list...

--Alex

On Tue, May 21, 2013 at 3:45 AM, Martin Braun (CEL) <address@hidden> wrote:

On Sun, May 19, 2013 at 02:57:35PM -0400, Alex Dusowitz wrote:
> I guess I can't use the bug tracker since I'm not a contributor! Am I right?
> Although I created an account ("Alexdu") in case I can be added by you. 

In case you couldn't already, now you can post.

> In the mean time, attached are 4 files, the FFT input, a simple test python
> code that takes the input and write the FFT result into an output file. The
> outputs are different when I run the code in 3.2.2 and 3.6.4!
>
>
> Also I couldn't relate this to FFT shift, I tried with both cases and still the
> results were different. FFT and IFFT wouldn't change this either.  

Have you tried explicitly setting the window? I faintly remember seeing
something like this a while ago... there was a weird default value for
window somewhere (not rectangular).

MB

--
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