Excellent, thank you all!
William Dunlap wrote:
attr(terms(formula), "response") is 1 if
the formula has a left hand side and 0
otherwise.
At a lower level, you can look at
length(formula): 2 means there is no LHS,
3 means there is (any other value indicates
that someone made a call object that the
parser would not make).
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-----Original Message-----
From: r-help-boun...@r-project.org
[mailto:r-help-boun...@r-project.org] On Behalf Of Erik Iverson
Sent: Monday, December 13, 2010 12:17 PM
To: R-help
Subject: [R] Does a formula object have a "left hand side"
Hello,
Does anyone know of a function that will determine whether
or not a formula object has a left hand side?
I.e., can differentiate between
y ~ x + z
and
~ x + z
Perhaps I'm overlooking the obvious...
Thanks!
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and provide commented, minimal, self-contained, reproducible code.
