[R] substituting values

[Chuck Cleland]

X <- matrix(c(  1, 2, 3,   4, "x",
               "x", 2, 2,   2,   2,
                 2, 2, 2, "x",   2),
             ncol=5, byrow=TRUE)

X.new <- matrix(as.numeric(X), ncol=ncol(X))

or

X.new <- apply(X, 2, function(x){replace(x, x == "x", NA)})

Stefan Semmeling wrote:
> dear list,
>  
> i have a matrix with missing values like
>  
> 1    2    3    4    x
> x    2    2    2    2
> 2    2    2    x    2
>  
> the x stands for the missing value.
> i have to substitute it to NA
>  
> substitute or replace didn´t work out, as they are for vectors only
>  
> however matrix[,i] also didn´t work.
>  
> can anybody tell me, who i can change these values easily?
>  
> thanks stefan
> 
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