From: Daniel Gerlanc <dgerlanc_at_gmail.com>

Date: Wed 26 Jul 2006 - 05:48:00 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Wed Jul 26 05:51:33 2006

Date: Wed 26 Jul 2006 - 05:48:00 EST

I sent the following message to R-help on July 14th, 2006:

Let's say I have the following formula:

left.hand.side <- "x"

right.hand.side <- c("y", "z")

Is there a better or cleaner way to do this?

I got one reply to try this (thanks Gabor!):

> all.vars(update(a.formula, .~0))

[1] "x"

> all.vars(update(a.formula, 0~.))

[1] "y" "z"

This works, but seems a bit of a hack.

There are two methods, "getCovariateFormula", and "getCovariate," which return, respectively, objects of class "formula" for the left and right hand sides of the formula. To get the right hand side or left hand side I wrap one of these method calls in a call to "all.vars". Is there a better way to get the left or right hand side of the formula, or is this it?

Thanks!

Dan Gerlanc

Williams College

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Wed Jul 26 05:51:33 2006

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