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How to use FFTW: Difference between revisions
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[[Category:Learning::HowTo]] | |||
==Getting Start== | = 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.''' | '''Note that I do this in Ubuntu operating system, in Windows some steps are different.''' | ||
* Step1: Download | * Step1: Download FFTW ([[http://www.fftw.org/download.html]]) | ||
* Step2: Extract and Configure it (my path: /home/jafarabadi/Documents/fftw-3.3.4)<br /> | * Step2: Extract and Configure it (my path: /home/jafarabadi/Documents/fftw-3.3.4)<br /><code>cd /home/jafarabadi/Documents/fftw-3.3.4<br />chmod ''x configure<br />./configure<br />make<br />make install</code> | ||
<br />* Step 3: Add library to project: first open [your_project_name].pro file in Qt Creator and add this line:<br /><code>LIBS''= -lfftw3<code> | |||
* Step | * Step 4: Example<br /></code>#include <fftw3.h&gt;</code><br /><code>int N; | ||
* | fftw_complex *in, '''out;<br />in = (fftw_complex''') fftw_malloc(sizeof(fftw_complex)'''N);<br />out = (fftw_complex''') fftw_malloc(sizeof(fftw_complex)*N); | ||
fftw_plan my_plan;<br />my_plan = fftw_plan_dft_1d(N, in, out, FFTW_FORWARD, FFTW_ESTIMATE);<br />fftw_execute(my_plan); | |||
fftw_destroy_plan(my_plan);<br />fftw_free(in);<br />fftw_free(out); | |||
// A short tutorial: http://www2.math.uu.se/~figueras/fftw_tutorial/text/fftw_tutorial.pdf</code> | |||
Revision as of 09:57, 24 February 2015
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<br />chmod ''x configure<br />./configure<br />make<br />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<br />
#include <fftw3.h>
int N;
fftw_complex *in, '''out;<br />in = (fftw_complex''') fftw_malloc(sizeof(fftw_complex)'''N);<br />out = (fftw_complex''') fftw_malloc(sizeof(fftw_complex)*N);
fftw_plan my_plan;<br />my_plan = fftw_plan_dft_1d(N, in, out, FFTW_FORWARD, FFTW_ESTIMATE);<br />fftw_execute(my_plan);
fftw_destroy_plan(my_plan);<br />fftw_free(in);<br />fftw_free(out);
// A short tutorial: http://www2.math.uu.se/~figueras/fftw_tutorial/text/fftw_tutorial.pdf