Message-ID: <428CD201.8050004@optonline.net>
Date: 2005-05-19T17:50:57Z
From: Chuck Cleland
Subject: does column exist?
In-Reply-To: <3f87cc6d05051910421ad010a9@mail.gmail.com>
How about is.null(df$X)==FALSE ?
Omar Lakkis wrote:
> How do I test if a data.frame has a column named X?
> exists(o) checks if the object exists or not, I want to test if a
> data.frame object (df) has a column names(X), something like:
> exists(df$X)
>
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Chuck Cleland, Ph.D.
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