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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