[R] How to find row maximum of two columns

[Gabor Grothendieck]

Try this:

pmax(tmax.m[,1], tmax.m[,2], na.rm = TRUE)


On 5/10/06, Dale Steele <Dale_Steele at brown.edu> wrote:
> Hello -- Given the 10x2 matrix below, my goal is to create a vector
> which contains the maximum of column 1 and column 2, or the only value
> if there is an NA in one column.  I experimented with max.col without
> success.  Thanks.  --Dale
>
>  > > tmax.m
>        tmaxhme tmaxer
>   [1,]   101.0   99.8
>   [2,]   102.5   99.0
>   [3,]   100.6   98.4
>   [4,]      NA  100.5
>   [5,]   101.0   99.4
>   [6,]      NA   97.6
>   [7,]      NA   99.0
>   [8,]    99.0   98.4
>   [9,]      NA   98.5
>  [10,]      NA   99.1
>
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