[R] filtering lines in a table

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Subject: [R] filtering lines in a table
From: Alexandre Fayolle (Alexandre.Fayolle@free.fr)
Date: Sun 10 Dec 2000 - 05:39:16 EST 

Message-ID: <3A328A64.537E129E@free.fr>

Hello,

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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