[R] Replacing all NA values in a matrix

[Uwe Ligges]

michael watson (IAH-C) wrote:

> 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 ;-)

Since you can index a matrix like a vector (it's a vector with a dim 
attribute), you can simply say something like:

  X[is.na(X)] <- 99999

Uwe Ligges



> Michael Watson
> Head of Informatics
> Institute for Animal Health,
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