[R] Divide matrix columns by different numbers
Berend Hasselman
bhh at xs4all.nl
Thu May 2 08:49:49 CEST 2013
On 02-05-2013, at 08:28, Sachinthaka Abeywardana <sachin.abeywardana at gmail.com> wrote:
> Hi all,
>
> I have a feeling the most efficient way to do the following is to use
> apply, but I'm still wrapping my head around the function.
>
> k=matrix(1:6,nrow=3)
>
> div=1:2
>
>
> Questions is how do I get R to divide the first column by 1 (div[1]) and
> the second column by 2 (div[2])
>
> k/div treats k as a vector and does the following (not what I want)
>
>> k/div
>
>
> [,1] [,2]
> [1,] 1 2
> [2,] 1 5
> [3,] 3 3
k / rep(div,each=nrow(k))
Berend
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