[R] How to find row maximum of two columns

Simon Blomberg blomsp at ozemail.com.au
Thu May 11 06:07:01 CEST 2006


apply(tmax.m, 2, max)

Dale Steele 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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-- 
Simon Blomberg, B.Sc.(Hons.), Ph.D, M.App.Stat.
Centre for Resource and Environmental Studies
The Australian National University
Canberra ACT 0200
Australia
T: +61 2 6125 7800 email: Simon.Blomberg_at_anu.edu.au
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