[R] filtering lines in a table
Uli Flenker; Raum 704
uli at biochem.dshs-koeln.de
Sun Dec 10 16:48:36 CET 2000
"help(boxplot)" among other things says:
boxplot.formula(formula, data = NULL, subset, na.action, ...)
So you can use
> boxplot(table$X ~ table$A,subset(table$B==given.value))
Any logical expression should work.
Institute of Biochemistry
German Sports University Cologne
50933 Cologne / Germany
On Sat, 9 Dec 2000, Alexandre Fayolle wrote:
> I realize this is probably a dumb question, but I think there must be an
> easy way to do this with R and I was not able to find it in the doc.
> I have a table (read from a file with read.table), with two factor
> columns, table$A and table$B, and a numerical column, table$X. I wish to
> make a boxplot of (table$X ~ table$A) for a given value of B. Is there
> a way to express this with a formula, or is it necessary to manually
> extract the right lines in the table? In that case, what is the best way
> to do so?
> Thanks for your help
> Alexandre "R newby" Fayolle
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