Wolfram Fischer wrote:
I have e.g. t <- matrix( nrow=2, ncol=3, byrow=TRUE, c('a1','a2','a3','b1','b2','b3') ) and i <- c( 3, 2)
Is it possible to formulate a simple expression that gets c( t[ 1, i[1] ], t[ 2, i[2] ] ) (and so on for longer matrices)?
The result would be: [1] "a3" "b2"
Two solutions are (there might be better ones):
a) mapply(function(x,y) t[x,y], 1:nrow(t), i) b) t(t)[i + (1:nrow(t) - 1) * (ncol(t))]
Note that calling the matrix "t" is not the best idea.
Uwe Ligges
Thanks - Wolfram
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