!is.null(my.obj...@my.data.frame$my.var)
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Kushan Thakkar
Sent: Friday, 11 February 2011 10:30 AM
To: r-help@r-project.org
Subject: [R] if a variable is defined
I have an object type my.object. One of its slots contains a data frame
(i.e. my.obj...@my.data.frame) .. I want to check if one of the variables
exists in this data frame (i.e. my.obj...@my.data.frame$my.var)
I am trying to use the exists function but can't figure out how the
arguments work. Please help.
So far I have tried
exists(my.obj...@my.data.frame$my.var)
exists("my.obj...@my.data.frame$my.var")
exists("my.var",where="my.obj...@my.data.frame")
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______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
