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

Charlottemia asked: 2021-03-15 matlab , signal , signal processing , pmtm

Investigating a potential documentation error in MATLABs pmtm function (Signal Processing Toolbox 6.2 R14)? Find expert insights and solutions here. Read now!

Expert Answer

Prashant Kumar answered . 2025-07-30 23:54:25

This bug has been fixed in Release 14 Service Pack 2 (R14SP2). For previous releases, please read below for any possible workarounds:

We have verified that the example in the PMTM function documentation is incorrect in Signal Processing Toolbox 6.2 (R14).

To work around this issue, please use the following code instead:

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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