[R] read.table and factor

Bill Simpson wsi at gcal.ac.uk
Mon Feb 21 12:16:05 CET 2000

> as.numeric(as.character(foo)), or if you really want to save space and 
> have lots of repeated values
> as.numeric(levels(foo))[as.numeric(foo)]
> > How can I either tell read.table to leave the first two cols as numeric
> > (not factors) or convert them from factors into the proper numeric values?

I found the source of the problem--it was not read.table!
After reading in the data frame I do:
d<-aggregate(d[,-(1:2)], by=list(std=d$std, cf=d$cf), sum)
*This* makes std and cf into factors.

Anyway I have a good solution: as.numeric(as.character(foo))
[It might be better to find a way to collapse the data without using

Thanks very much for the help Brian.


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