I suspect that loop would be the fastest since it would have the least memory overhead. You do not want to have too many internal copies of 7000x7000 matrices.
Jarek ====================================================\==== Jarek Tuszynski, PhD. o / \ Science Applications International Corporation <\__,| (703) 676-4192 "> \ [EMAIL PROTECTED] ` \ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tim Smith Sent: Friday, October 07, 2005 2:48 PM To: r-help@stat.math.ethz.ch Subject: [R] Applying a function to each element of an array Hi, I have a 7000x7000 matrix, and each element is an integer. For each element, I want to apply the function : wt <- 0 for(q in 1:count){ wt <- wt + 0.5^(q-1) } I get the value of 'count' from the elements in the matrix , and want to store the corresponding 'wt' value for that element. I suppose I could loop through the matrix, and apply the function to each element but this would take a really really long time. Are there any quicker ways to get the same result? many thanks, Tim --------------------------------- [[alternative HTML version deleted]] ______________________________________________ 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 ______________________________________________ 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
