But isn't it change multiplication order? WBR Dima
2010/6/29 <[email protected]> > Since X is a vector, then > > A <- sum(X, solve(V, X)) > > is probably slightly better here. > > -----Original Message----- > From: [email protected] [mailto:[email protected]] > On Behalf Of Dmitrij Kudriavcev > Sent: Tuesday, 29 June 2010 12:29 PM > To: [email protected] > Subject: [R] Matrix operations > > Hello > > I have a quick question. > > I need to compute matrix in R, like A <- t(X) %*% solve(V) %*% X, where X > is > a vector and V is a matrix > > This code works, but now i want to optimize it. I have try: > > A <- crossprod(X, solve(V)) %*% X > > Is there another, better way? > > WBR > Dima > > [[alternative HTML version deleted]] > > ______________________________________________ > [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 > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] ______________________________________________ [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 and provide commented, minimal, self-contained, reproducible code.
