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...m1=1 (column sums), dim2=162, dim3=56) Not sure how clear I've explained this, but any suggestions would be really helpful. Most appreciatively: Brian Campbell -- View this message in context: http://r.789695.n4.nabble.com/Multi-part-problem-array-manipulation-and-sampling-tp4535476p4535476.html Sent from the R help mailing list archive at Nabble.com.

I have data that looks like this: > df1 group id 1 red A 2 red B 3 red C 4 blue D 5 blue E 6 blue F I want a list of the groups containing vectors with the ids. I am avoiding subset(), as it is only recommended for interactive use. Here's what I have so far: df1 <- data.frame(group=c("red", "red", "red", "blue",