I had the advantage of studying
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
"The New S Language". Wadsworth & Brooks/Cole.
before starting to use R. That book was reissued by CRC Press
only a few years ago. It's *still* a pretty darned good intro
to R. cut, pretty, and
Hana, the "right" answer depends on exactly what you need. Here are three
correct solutions. They use the same basic strategy to give different results.
There are also other approaches in R to get the same outcome. You could use
data_catigocal[i,j] and some for loops.
size1 <-5
ngroup <-
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