Thanks Jim for the help. I forgot to say that one of my main snags is figuring how how to chop up the one long (44100 samples) vector into pieces (400 of them).
This is my C-inspired way of thinking but there must be a better way in R. cyclelength=44100/400 for i= 1 to 400 for j= 1 to cyclelength y[i,j]=x[i*j] next next Once that's done I can average over rows Thanks for any suggestions Bill ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
