Hos Bispectrum computation error

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jaypal singh
jaypal singh 2021-1-28
Dear Friends;
I am computing HOS Bi-spectrum feature for Row x Colume (1x1000 ) of ECG signal. I am geeting 1x45 as a feature in ans. I am confusing what represents 45 column in ans. The code for HOS Bi-spectrum is belowed:
function [features, featuresName, map] = signal_hosBispectrum(signal, options, varargin)
if isempty(options)
options.maxlag = 8;
options.sampleSeg = 32;
options.overlap = 50;
options.nfft = 64;
options.wind = 1;
options.pt2 = 40;
end
cmat1 = [];
cum3_principal_domain = [];
cmat1 = bispeci(signal, options.maxlag, options.sampleSeg, options.overlap, 'biased', options.nfft, options.wind);
sizeCmat1 = size(cmat1, 2);
half = round((sizeCmat1/2));
for ii=half:options.pt2 % Manually set
for jj=half:ii,
cum3_principal_domain = [cum3_principal_domain, abs(cmat1(ii, jj))];
end
end
hos = cum3_principal_domain;
if length(varargin)==1
headerTxt = [varargin{1}, '_'];
else
headerTxt = '';
end
for h=1:size(hos, 2)
headers(:, h) = {[headerTxt, 'HOS_Bispectrums', num2str(h)]};
end
map = abs(cmat1);
featuresName = headers;
features = hos;
end

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