calculate xcorr for some particular lag position

Hello everyone,

xcorr function allows to calculate cross-correlation between x and y for a range of lag positions (-maxlags:+maxlags) when following command is used.

c=xcorr(x,y,maxlags);

But, I want to calculate cross-correlation for some definite lag positions. For example, my lag range is 4:12. How can I do it?

-saima