How to Cross-correlation in matlab without using the inbuilt function?

 can someone tell how to do the cross-correlation of two speech signals (each of 40,000 samples) in MATLAB without using the built-in function xcorr and the correlation coefficient?

Thanks in advance. 

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Answers: 
You can do cross-correlations using fft. The cross-correlation of two vectors is simply the product of their respective Fourier transforms, with one of the transforms conjugated.
Example: 
 
 a=rand(5,1);
b=rand(5,1);
corrLength=length(a)+length(b)-1;

c=fftshift(ifft(fft(a,corrLength).*conj(fft(b,corrLength)))); 
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https://matlabhelpers.com/questions/how-to-cross-correlation-in-matlab-without-using-the-inbuilt-function-.php

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