On 8/5/2005 12:16 PM, Martin C. Martin wrote: > 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?
You'd probably do better with matrix multiplication: rep(1, nrow(A)) %*% A Duncan Murdoch ______________________________________________ [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
