Replacing the NA?s with eg. 1 :
> a
1 2 3 4
1 20 50 10 80
2 NA 19 NA 49
3 NA 32 NA 61
4 45 101 44 190
a[try(is.na(a)) == TRUE] <- 1
> a
1 2 3 4
1 20 50 10 80
2 1 19 1 49
3 1 32 1 61
4 45 101 44 190
I this can help you,
Matthias
> -----Urspr?ngliche Nachricht-----
> Von: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch] Im Auftrag von
> michael watson (IAH-C)
> Gesendet: Mittwoch, 05. J?nner 2005 15:26
> An: R-help at stat.math.ethz.ch
> Betreff: [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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