On Mon, 25 Jul 2005, Uwe Ligges wrote: > Laura Holt wrote: > >> Hi R! >> >> I have a 3 dimensional array, which is 21 x 3 x 3 >> >> I want to use apply to sum on each 21x3 matrix, which is fine. >> >> Is there a way that I can do this in 1 step instead of a loop (3), please? > > Don't know which direction you mean, I guess one of the following: > > apply(x, c(1,2), sum) > apply(x, 3, sum)
Or use rowSums or colSums for clarity (and speed, irrelevant here). -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
