[Scilab-users] [Users] Discrete cosine transform

[TViT]

Say please why the example, given in the help does not work? What
communication(connection) DCT and FFTw?
In my representation FFT through one script is carried out, and DCT through
another script however dct.sci has not found in Scilab 5.4.0

//----------------------------------
-->d=dct(s);
         !--error 999 
dct: Creation of requested fftw plan failed.

//----------------------------------
// build a sampled at 1000hz  containing pure frequencies 
// at 50 and 70 Hz
sample_rate=1000;
t = 0:1/sample_rate:0.6;
N=size(t,'*'); //number of samples
s=sin(2*%pi*50*t)+sin(2*%pi*70*t+%pi/4)+grand(1,N,'nor',0,1);
d=dct(s);
// zero low energy components
d(abs(d)<1)=0;
size(find(y1<>0),'*') //only 30 non zero coefficients out of 600
clf;plot(s,'b'),plot(dct(d,1),'r')



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