MATLAB: How To Link FFTW with Mex

fftwmex

I am trying to use FFTW library with mex. So far, I have been unable to link them successfully.
I downloaded the latest available pre-compiled packages for windows from FFTW website. Then build the libraries using Visual Studio 2015 cmd, with command * 'lib /machine:x64 /def:libfftw3-3.def'*. A part of my mex file is as follows.
#include <stdlib.h>
#include <math.h>
#include "C:\Users\wwij0001\Downloads\matlab-mex\q_ldpc_decoding\fftw3.h"
#include "mex.h"
void q_ldpc_decoder(size_t nc, size_t nv, double Q, double *H, double *y, double R, double z, double *cOnes, double *indexC, double *rOnes, double *indexR, double *perm, double *perm1, double *op)
{
    //check variables-----------------------------------------------------------
    mexPrintf("nc:%d, nv:%d, Q:%g, R:%g, z:%g\n", nc, nv, Q, R, z);
      int i, j, k, round, t;
      double *M;
      double *MT;
      double *T_INI;
      double *V_SUM;
      double sum;
      int index, t_index;
      //create fftw plans---------------------------------------------------------
      fftw_plan p = fftw_create_plan(Q, FFTW_FORWARD, FFTW_ESTIMATE);
Now, for building the mex file, I use command,
mex -LC:\Users\wwij0001\Downloads\matlab-mex\q_ldpc_decoding\libfftw3-3.dll -llibfftw3-3.lib q_ldpc_decoder.c
But matlab is giving error,
Error using mex
   Creating library q_ldpc_decoder.lib and object q_ldpc_decoder.exp
q_ldpc_decoder.obj : error LNK2019: unresolved external symbol fftw_create_plan referenced in function q_ldpc_decoder
q_ldpc_decoder.mexw64 : fatal error LNK1120: 1 unresolved externals
I am using 2016b version.

Best Answer

try this one instead: mex -LC:\Users\wwij0001\Downloads\matlab-mex\q_ldpc_decoding -llibfftw3-3.lib q_ldpc_decoder.c
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