Hi,
I am trying to replace a single numeric value in a matrix with a character
vector.

>mat[5580, 4]
[1] 838.1

> mat.r <- replace(mat, mat[5580, 4], "NA")

I don't get any errors. However when I go to see if the number at mat[5580,
4] was replaced with "NA"
the old number is still there. I don't get any errors.

>mat.r[5580, 4]
[1] 838.1

Any hints on how to do this?
Thanks,

MAB

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