[R] mark values as NA in matrix

Petr Pikal petr.pikal at precheza.cz
Thu Sep 22 10:42:43 CEST 2005


there is not much to evaluate what you actually want 

mymatrix[1,2] <- NA

changes respective value in row1 and col2 to NA


which(is.na(mymatrix), arr.ind=T)

gives you positions of NA in mymatrix.



On 21 Sep 2005 at 20:07, MK wrote:

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Petr Pikal
petr.pikal at precheza.cz

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