Message-ID: <20120601082906.230100@gmx.net>
Date: 2012-06-01T08:29:06Z
From: Johannes Radinger
Subject: Redefine multiple columns (using grep) as factor variables
Hi,
I have a dataframe with around 100 columns. Now I want
to redefine some of the columns as factors (using as.factor).
Luckily all the names of the columns I want to redefine start with
"crast". Thus I thought I can use grep() for that purpose...
...I found an example for redefining a single column as factor
but that is not working with multiple columns I get from grep()...
what I tried so far:
df[, grep("^crast", colnames(df))] <- as.factor(df[, grep("^crast", colnames(df))])
any suggestions?
cheers,
/Johannes
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