[R] ave across columns

[Hedderik van Rijn]

x <- matrix(rnorm(60),20)
x[sample(1:60,10)] <- NA
apply(x,1,mean,na.rm=T)

On Monday, January 20, 2003, at 04:27 PM, Truc Truong wrote:

> Hi:
>
> How do I find average across three columns such as weight1, weight2, 
> weight3 (20 people, each person has three different measures)? They 
> have NA's also.  Thanks
>
> Tom, Univ of Pittsburgh, ttrut at yahoo.com
>
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>
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