[R] Replacing all NA values in a matrix

[Dimitris Rizopoulos]

Hi Michael,

try this:

mat <- matrix(1:25, 5, 5)
mat[sample(25, 10)] <- NA
mat
#####
mat[is.na(mat)] <- 100
mat

I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "michael watson (IAH-C)" <michael.watson at bbsrc.ac.uk>
To: <R-help at stat.math.ethz.ch>
Sent: Wednesday, January 05, 2005 3:26 PM
Subject: [R] Replacing all NA values in a matrix


> OK, dumb question, and it is probably in the docs somewhere, but 
> after
> 12 months working with R and quite a while looking at the docs, I 
> still
> don't know (or have forgotten) how to replace all NA values in a 
> matrix
> at once with some other value.  I can do it column by column using
> is.na(), but I can't figure out how to do it for the whole matrix. 
> My
> apologies, I am ashamed ;-)
>
> Michael Watson
> Head of Informatics
> Institute for Animal Health,
> Compton Laboratory,
> Compton,
> Newbury,
> Berkshire RG20 7NN
> UK
>
> Phone : +44 (0)1635 578411 ext. 2535
> Mobile: +44 (0)7990 827831
> E-mail: michael.watson at bbsrc.ac.uk
>
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