Hi
you shall probably to be more specific
tj<-rnorm(5)
vj<-matrix(25,5,5)
sum(tj*vj)
[1] 149.2977
gives you an answer but maybe not the answer you want.
HTH
Petr
On 3 Oct 2006 at 8:58, Dina Said wrote:
Date sent: Tue, 03 Oct 2006 08:58:15 +0200
From: Dina Said <dinasaid at gmail.com>
To: r-help at stat.math.ethz.ch
Subject: [R] Summation in R
> Hello!
>
> Maybe this is a trivial question as I'm still a new baby in R but I
> wish that u will help me.
>
> I want to calculate the following
>
> U= sum (t_j*v_j)
>
> where t_j is a vector
> and v_j is the matrix
>
> Thanks
> Dina
>
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> PLEASE do read the posting guide
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> minimal, self-contained, reproducible code.
Petr Pikal
petr.pikal at precheza.cz