Is there an error in the documentation of PMTM function in Signal Processing Toolbox 6.2 (R14)?

Charlottemia - 2021-03-15T09:49:27+00:00

Question: Is there an error in the documentation of PMTM function in Signal Processing Toolbox 6.2 (R14)?

I tried to run the following commands in the example of the PMTM documentation:     randn('state',0); fs = 1000; t = 0:1/fs:0.3; x = cos(2*pi*t*200) + 0.1*randn(size(t)); [Pxx,Pxxc,f] = pmtm(x,3.5,512,fs,0.99); hpsd = dspdata.psd([Pxx Pxxc],{f,fs}) plot(hpsd) I received the following errors: ??? Error using ==> dspdata.abstractfreqresp.initialize The number of frequency points must equal the length of the data.  

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Expert Answer

Prashant Kumar answered . 2025-11-20

randn('state',0);

fs = 1000; 

t = 0:1/fs:0.3;

x = cos(2*pi*t*200) + 0.1*randn(size(t));

[Pxx,Pxxc,f] = pmtm(x,3.5,512,fs,0.99);

hpsd = dspdata.psd([Pxx Pxxc],'Fs',fs);  % <----- the corrected line

plot(hpsd)

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