Energy at Frequency how to find out

i want to know what is the meaning of the last function in this code

features.EnergyAtFreqX(i,:) = sum(signalX_FFT(1:1,2));

what it gives at output

 signalX = data.X(i,:);%signal X as temperory variable for operations
        features.StdX(i,:) = std(signalX);%Satndard Daviation of Signal X 3rd coummn
        signalX = (signalX - mean(data.X(i,:)))/features.StdX(i,:); %Standardization      
        signalX_FFT = sortrows([f;computeFFT(signalX,L)]',2,'descend');%sortrows(data,column,'accending or decending')
        features.FreqX(i,:) = signalX_FFT(1,1);       
        features.EnergyAtFreqX(i,:) = sum(signalX_FFT(1:1,2));

Answer 1

[Anmol Dhiman]

Hi Aniket,

From the code it is unclear what 'computeFFT' does. However looking at the code, I can tell that that by using sortrows they are trying to find the frequency with the largest magnitude.

To answer about the last statement, one has to look into how computeFFT is defined.

Hope it helps