This one works within block sizes of 64, by using an [block~ 128 2] .
Now, I've got one where you add an argument and use arbitrary block sizes. It's much more useful, this way. [sxcov~ 2048] works within a blocksize of 2048, and calculates the symmetric cross covariance of two signals.
Still having aggravating time, trying to normalize by the proper calculation of variance on each signal. It might be a while before I get it together.
Chuck