[R] Matrix operations in a list

From: Doran, Harold <HDoran_at_air.org>
Date: Tue 23 Jan 2007 - 15:21:52 GMT

I have matrices stored within a list like something as follows:

a <- list(matrix(rnorm(50), ncol=5), matrix(rnorm(50), ncol=5)) b <- list(matrix(rnorm(50), nrow=5), matrix(rnorm(50), nrow=5))

I don't recall how to perform matrix multiplication on each list element such that the result is a new list

result <- list(a[[1]]%*%b[[1]], a[[2]]%*%b[[2]])

I think I'm close with mapply(), but I'm doing something silly

mapply('%*%', a,b)


        [[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 and provide commented, minimal, self-contained, reproducible code. Received on Wed Jan 24 02:25:37 2007

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Tue 23 Jan 2007 - 16:30:29 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.