Richard M. Heiberger <rmh <at> temple.edu> writes:
>
> ## Can someone suggest a simpler expression than either of these, with the
> goal
> ## of taking a long matrix into a wide one with exactly one of the factors
> converted to
> ## columns and all the rest retained as factors. I want something that
> generalizes beyond
> ## the three factors illustrated here.
>
> ## Rich
>
> meltTest <- data.frame(A=rep(c("B","C"), each=12),
> D=rep(c("E","F","G"), each=4, times=2),
> H=rep(c("I","J","K","L"), times=6),
> M=1:24)
>
amat <- ftable( xtabs( M ~ A + D + H, meltTest ),row.vars=1:2 )
amat is such a matrix with a few attributes added.
HTH,
Chuck
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