Message-ID: <Pine.LNX.4.44.0305301706480.8311-100000@gannet.stats>
Date: 2003-05-30T16:10:15Z
From: Brian Ripley
Subject: How to remove a complete dataframe column
In-Reply-To: <114104136437.20030530165107@power.inescn.pt>
On Fri, 30 May 2003, Mark Marques wrote:
> I am using dataframes and I and I want to delete (remove) a specific
> column by name ...
> the data frame has 14 columns with several names and only need some.
> I tried to overwrite the columns with a single value but that in not very
> clean as I need to export the data to file.
> The rm command gives me a warning message stating :
> < remove: variable "rtu$Ri." was not found >
> or there is another method to remove parts of a dataframe?
You make a copy selecting the names you want, as in
rtu2 <- rtu[!(names(rtu) %in% c("Ri", "another I do not want"))]
or
rtu3 <- rtu[c("var2", "var7")]
--
Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595