Re: [R] Indexing on a variable that is a factor

2006-09-09 Thread Farrel Buchinsky
Yes, same way. I had been battling before and then solved it between my post and your response. ICA[Strain=="49134",] One just has to be careful to recognize that it is being handled as a character variable and so one has to use the level label. On 09 Sep 2006 19:08:39 +0200, Peter Dalgaard <[EM

Re: [R] Indexing on a variable that is a factor

2006-09-09 Thread Uwe Ligges
Farrel Buchinsky wrote: > It is easy to index on numeric variables. > How does one index on a variable that is a factor? > Same as for numeric objects. Example: R> x <- factor(c("A", "B")) R> x [1] A B Levels: A B R> x[1] [1] A Levels: A B __ R-he

Re: [R] Indexing on a variable that is a factor

2006-09-09 Thread Peter Dalgaard
"Farrel Buchinsky" <[EMAIL PROTECTED]> writes: > It is easy to index on numeric variables. > How does one index on a variable that is a factor? Er, same way. Unless you attach some novel meaning to "index on". Example? -- O__ Peter Dalgaard Øster Farimagsgade 5, Entr.B c

[R] Indexing on a variable that is a factor

2006-09-09 Thread Farrel Buchinsky
It is easy to index on numeric variables. How does one index on a variable that is a factor? -- Farrel Buchinsky, MD Pediatric Otolaryngologist Allegheny General Hospital Pittsburgh, PA __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mail