Error using pwelch - Expected x to be finite.

Hi everyone,

x=load('\\fs01.hpc.unipr.it\bonini01\WIRELESS_Wifi_Router_Impianti2021\Acquisizioni Deuteron\ProvaHyper_20220915_M1\LFP1.mat');
input=x.LFP1;
y=fft(x.LFP1);
M1_LFP1=rmmissing(input);
N=64;
window=hamming(N);
noverlap=N/2;
nfft=length(M1_LFP1);
new_fs=542.4;
time_1=(1:length(M1_LFP1))/new_fs;
[s,f,t]=spectrogram(M1_LFP1,window,noverlap,nfft,new_fs);
colormap('jet');

This is my code to compute the spectrogram but when I'm running it appears this error:

Error using pwelch - Expected x to be finite.

My x, namely M1_LFP1, is a vector 1358x1, what is the problem?

Answer 1

[dpb]

x=load('\\fs01.hpc.unipr.it\bonini01\WIRELESS_Wifi_Router_Impianti2021\Acquisizioni Deuteron\ProvaHyper_20220915_M1\LFP1.mat');
input=x.LFP1;
M1_LFP1=rmmissing(input);
sum(~isfinite(M1_LFP1))

will show you how many elements are NOT finite in your input data -- some clearly are.

isBad=~isfinite(M1_LFP1);   

will return the actual locations in logical addressing vector that you can see whether are nan or inf; you can, of course, count/find each of those with the appropriate functions isnan, isinf

[Felicia DE CAPUA]

Thanks a lot!