Peter, Thank you for your array() hint for multi-dimensional matrices.
Actually, my final answer should be of dimension 5,3,2 because my funcp(a,b,c) will be reduced to one number when I set a to a column of x, b to a column of y, and c to a column of z. I did make some useful observations, though: 1. expand.grid() is useful for determining all the permutations of indexes I need to use on the columns of x,y,z: for example: expand.grid( 1:5, 1:3, 1:2 ) or expand.grid( list( 1:5, 1:3, 1:2 )); # the last one is useful when I don't know how many dimensions I need to go - eg I may have 7 matrices. 2. I hate to do it, but memory usage can blow up really fast, so it looks like I need to do some nested looping to get the job done - maybe I can change these to xapply() later. - Ken -- View this message in context: http://www.nabble.com/n-dimensional-vector-operations-tp23147607p23148994.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
