[R] replacing values in a matrix or data.frame

Dimitris Rizopoulos dimitris.rizopoulos at med.kuleuven.ac.be
Mon Jul 5 11:53:23 CEST 2004


you could try something like this,

x <- matrix(sample(1:10,25, rep=TRUE), 5 ,5)

apply(x, 2, function(y){
  a <- table(y)
  rep(a/sum(a), a)

I hope this helps.


Dimitris Rizopoulos
Doctoral Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/396887
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/

----- Original Message ----- 
From: <assuncao.senra at portugalmail.com>
To: <r-help at stat.math.ethz.ch>
Sent: Monday, July 05, 2004 11:32 AM
Subject: [R] replacing values in a matrix or data.frame

> Hi,
> I have a matrix where I want to replace the entries of each column
by the
> proportion value of the times each entrie appears in that column,
that is, In
> each column there 4 to 10 repeated values, for wich i can compute
> in the respective column, and then i want to replace each value for
> respective frequencie in another matrix. Can someone help me?
> Thanks for all the help.
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