r - I'm getting an error when I try to replace NA with 0 -

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mergedata large matrix, trying replace na 0 did "googling" , found code below not work because 

mergeddata[is.na(mergeddata)] <- 0  warning message: in `[<-.factor`(`*tmp*`, thisvar, value = 0) :   invalid factor level, na generated

further research had me doing for loops i'm still not getting it. recommendations on how this?


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