[R] Matrix operations

[Bill.Venables at csiro.au]

Since X is a vector, then

A <- sum(X, solve(V, X)) 

is probably slightly better here.

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Dmitrij Kudriavcev
Sent: Tuesday, 29 June 2010 12:29 PM
To: r-help at r-project.org
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

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