>> apply(mt, 1, function(x) x[!is.nan(x)] )
> [[1]]
> [1] 1 3
>
> [[2]]
> [1] 4 5 6
You need to be a little careful with apply:
> mt2 <- matrix(c(1,4,2,5,3,6),2,3)
> apply(mt2, 1, function(x) x[!is.nan(x)] )
[,1] [,2]
[1,] 1 4
[2,] 2 5
[3,] 3 6
Depending on the input you will get a list or matrix as output.
Hadley
--
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/
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