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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