[R] Divide matrix columns by different numbers

arun smartpink111 at yahoo.com
Thu May 2 14:29:03 CEST 2013



  t(t(k)/div)
#     [,1] [,2]
#[1,]    1  2.0
#[2,]    2  2.5
#[3,]    3  3.0
A.K.

----- Original Message -----
From: Sachinthaka Abeywardana <sachin.abeywardana at gmail.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Thursday, May 2, 2013 2:28 AM
Subject: [R] Divide matrix columns by different numbers

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



Thanks,
Sachin

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