Re: [R] Matrix operations

From: Dmitrij Kudriavcev <dimitrij.kudriavcev_at_ntsg.lt>
Date: Tue, 29 Jun 2010 13:07:49 +1000

But isn't it change multiplication order?

WBR
Dima

2010/6/29 <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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>
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