[R] Replacing all NA values in a matrix
Liaw, Andy
andy_liaw at merck.com
Wed Jan 5 15:56:53 CET 2005
What you should keep in mind is that a matrix in R is nothing more than a
vector (formed by stacking the columns of the matrix) with the dim
attribute. Thus you can do what you want to do by treating the matrix as a
vector; e.g.,
mymat[is.na(mymat)] <- myFavoriteValue
HTH,
Andy
> From: michael watson (IAH-C)
>
> 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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