[R] Multiply row of a matrix

[William Dunlap]

> 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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