rcoder <[EMAIL PROTECTED]> wrote:
> I have a matrix that has a combination of zeros and NAs. When I perform
> certain calculations on the matrix, the zeros generate "Inf" values. Is
> there a way to either convert the zeros in the matrix to NAs, or only
> perform the calculations if not zero (i.e. like using something similar to
> an !all(is.na() construct)?
Is this what you are looking for?
> # make some data
> a = matrix(c(rep(0,6), rep(2,6)), nrow = 4)
> a
[,1] [,2] [,3]
[1,] 0 0 2
[2,] 0 0 2
[3,] 0 2 2
[4,] 0 2 2
> # change zero to NA
> is.na(a[a==0] ) <- TRUE
> a
[,1] [,2] [,3]
[1,] NA NA 2
[2,] NA NA 2
[3,] NA 2 2
[4,] NA 2 2
--
Mike Prager, NOAA, Beaufort, NC
* Opinions expressed are personal and not represented otherwise.
* Any use of tradenames does not constitute a NOAA endorsement.
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