See ?colSums. Andy
> From: Martin C. Martin > > Hi, > > I have a 5x731 array A, and I want to compute the sums of the > columns. > Currently I do: > > apply(A, 2, sum) > > But it turns out, this is slow: 70% of my CPU time is spent > here, even > though there are many complicated steps in my computation. > > Is there a faster way? > > Thanks, > Martin > > ______________________________________________ > [email protected] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > > ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
