Re: [Discuss-gnuradio] FFTW3 error in GNURADIO

[Nasi]

Thanks for quick reply!

It does not work even if I use float precision as

fftwf_complex *in2, *out2;
out2 = (fftwf_complex*) fftwf_malloc(NFFT*2*sizeof(fftwf_complex));
in2 = (fftwf_complex*) fftwf_malloc(NFFT*2*sizeof(fftwf_complex));

I attach cmake files. It would be nice of you if you take a look.

-
NE

Fri, 21 Mar 2014 11:18:45 +0100 от Marcus Müller <address@hidden>:

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The (F) was meant to say:
Use FFTW3_LIBRARIES if you want to use the double precision version,
use FFTW3F_LIBRARIES if you want the single (float, 'F') precision
version of the library.

Since you're using
fftw_malloc (without f suffix), you're trying to use the double prec.
version of the library, but you link against the single prec. version.

Greetings,
Marcus

PS: The GNU Radio complex data type is identical to the float complex
datatype used by FFTW3F. If you want to use that, use the float
version of the library and replace fftw_malloc by fftwf_malloc and so on.



On 21.03.2014 10:35, Nasi wrote:
> Hi all,
>
> I am using ubuntu 13.04 and GNURADIO 3.7.
>
> In project https://github.com/BogdanDIA/gr-dvbt , in
> reference_signals_impl.cc in /lib, I add inside one of the
> functions:
>
> fftw_complex *in2, *out2; out2 = (fftw_complex*)
> fftw_malloc(NFFT*2*sizeof(fftw_complex)); in2 = (fftw_complex*)
> fftw_malloc(NFFT*2*sizeof(fftw_complex)); I get this error:
> ~/gr-dvbt/apps$ sudo ./top_block_rx.py Traceback (most recent call
> last): File "./top_block_rx.py", line 23, in <module> import dvbt
> File "/usr/local/lib/python2.7/dist-packages/dvbt/__init__.py",
> line 45, in <module> from dvbt_swig import * File
> "/usr/local/lib/python2.7/dist-packages/dvbt/dvbt_swig.py", line
> 26, in <module> _dvbt_swig = swig_import_helper() File
> "/usr/local/lib/python2.7/dist-packages/dvbt/dvbt_swig.py", line
> 22, in swig_import_helper _mod = imp.load_module('_dvbt_swig', fp,
> pathname, description) ImportError:
> /usr/local/lib/libgnuradio-dvbt.so: undefined symbol: fftw_malloc
>
> I read and did the articles:
> http://lists.gnu.org/archive/html/discuss-gnuradio/2014-02/msg00479.html
> and
> http://gnuradio.4.n7.nabble.com/FFTW3-runtime-error-td46690.html .
> However, in lib I cannot add ${FFTW3(F)_LIBRARIES} to your
> lib/CMakeLists.txt. It gives me an error. Therefore I replaced that
> with ${FFTW3F_LIBRARIES}.
>
> Where am I making mistake?
>
> - NE
>
>
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-- 
NE

CMakeLists.txt
Description: Text document

CMakeLists.txt
Description: Text document

FindFFTW3.cmake
Description: Binary data