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How to use FFTW: Difference between revisions
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Revision as of 15:45, 3 March 2015
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How to compute FFT using FFTW in Qt
Getting Start
Note that I do this in Ubuntu operating system, in Windows some steps are different.
- Step1: Download FFTW ([[1]])
- Step2: Extract and Configure it (my path: /home/jafarabadi/Documents/fftw-3.3.4)
cd /home/jafarabadi/Documents/fftw-3.3.4
chmod ''x configure
./configure
make
make install
- Step 3: Add library to project: first open [your_project_name].pro file in Qt Creator and add this line:
LIBS''= -lfftw3<code>
* Step 4: Example
#include <fftw3.h>
int N;
fftw_complex *in, '''out;
in = (fftw_complex''') fftw_malloc(sizeof(fftw_complex)'''N);
out = (fftw_complex''') fftw_malloc(sizeof(fftw_complex)*N);
fftw_plan my_plan;
my_plan = fftw_plan_dft_1d(N, in, out, FFTW_FORWARD, FFTW_ESTIMATE);
fftw_execute(my_plan);
fftw_destroy_plan(my_plan);
fftw_free(in);
fftw_free(out);
// A short tutorial: http://www2.math.uu.se/~figueras/fftw_tutorial/text/fftw_tutorial.pdf