[R] Multiply row of a matrix
William Dunlap
wdunlap at tibco.com
Tue Feb 21 18:00:59 CET 2017
> Mat * c(3, 1, 0.5)
[,1] [,2] [,3]
[1,] 3.0 6 9.0
[2,] 4.0 5 6.0
[3,] 3.5 4 4.5
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Tue, Feb 21, 2017 at 8:23 AM, <ac.dasilva at ulg.ac.be> wrote:
> If we have the following matrix:
>
> Mat<-matrix(1:9, byrow=TRUE, nrow=3)
> Mat
>
> [,1] [,2] [,3]
> [1,] 1 2 3
> [2,] 4 5 6
> [3,] 7 8 9
>
> I would like to have each row multiplied by a different number.
> So I would like row 1 multiplied by 3, row2 by 1 and row3 by 0.5
> Which would give:
>
> [,1] [,2] [,3]
> [1,] 3 6 9
> [2,] 4 5 6
> [3,] 3.5 4 4.5
>
>
> Whatever I try, I always obtain
> [,1] [,2] [,3]
> [1,] 3 2 1.5
> [2,] 12 5 3.0
> [3,] 21 8 4.5
>
> Which corresponds to the columns multiplied by the factors
>
> Could anyone help we to get the proper result ?
> Best, Anne-Christine da Silva
>
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