Is there a simple way to calculate the maximum for a row or column of a
matrix when there are NA,s present.
# given a matrix that has any number of NA per row
> m<-matrix(c(seq(1,9)),nrow=3)
> m
[,1] [,2] [,3]
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
> m[3,1]=NA
> m[1,]=NA
> m
[,1] [,2] [,3]
[1,] NA NA NA
[2,] 2 5 8
[3,] NA 6 9
# applying max to rows doesnt work as max returns
# NA if any of the elements is NA.
> row_max<-apply(m,1,max)
> row_max
[1] NA 8 NA
# my desired result given m would be:
# NA, 8, 9
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