File:Example dft dct.svg
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Original file (SVG file, nominally 600 × 480 pixels, file size: 16 KB)
Summary
| Description |
The plot shows the differences between a DFT and a DCT of a generic signal. The first plot is a sampled ramp in the time domain. The second one represents the modulus of its DFT. The third one the plot of its DCT. I obtained it in a two step process. First I ran the following Matlab code: thus creating a file called example_dft_dct.dat. Then I ran the following Gnuplot code: |
| Date | |
| Source | Own work |
| Author | Alessio Damato |
| SVG development |  This W3C-invalid plot was created with gnuplot. |
| Source code | Matlab coden = 0:10;
E = [ n; abs(fft(n)); dct(n)];
E = E';
save -ascii 'example_dft_dct.dat' E;
Gnuplot code# set the output
set terminal svg
set output "example_dft_dct.svg"
# axis properties
set xlabel "n"
set xrange [-1:11]
set xzeroaxis linetype -1 linewidth 0.5
set yzeroaxis linetype -1 linewidth 0.5
set xtics axis
unset ytics
set key off
set pointsize 1.5
# Set up a four-pane multiplot
set size 1,1
set origin 0,0
set multiplot
set title "A generic sampled signal"
set size 1,0.35
set origin 0,0.69
plot "example_dft_dct.dat" using 1:1 with points 1
plot "example_dft_dct.dat" using 1:1 with impulses 1
set title "The modulus of its DFT"
set size 1,0.35
set origin 0,0.36
plot "example_dft_dct.dat" using 1:2 with points 2
plot "example_dft_dct.dat" using 1:2 with impulses 2
set title "Its DCT"
set size 1,0.35
set origin 0,0.03
plot "example_dft_dct.dat" using 1:3 with points 3
plot "example_dft_dct.dat" using 1:3 with impulses 3
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Licensing
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
  
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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | |
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| This licensing tag was added to this file as part of the GFDL licensing update. |
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:43, 18 November 2005 | | 600 × 480 (16 KB) | wikimediacommons>Alejo2083 | The plot shows the differences between a en:DFT and a en:DCT of a generic signal. The first plot is a sampled ramp in the time domain. The second one represents the modulus of its DFT. The third one the plot of its DCT. I obtained it in a two |
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