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decagon
2010 Mar 11
6
tm[,-1]
This does what I was hoping it would:
aggregate(tm[,-1],by=list(tm[,10]),FUN="mean")
but I don't know what "tm[,-1]" means (well - the -1 bit anyway.
Does it somehow means the whole matrix?
Please don't tell me to check the manual - I tried and failed dismally...
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