Joel Schwartz wrote:
Cc: r-sig-teaching@r-project.org
Subject: Re: [R-sig-teaching] Reverse the scoring of some Columns of a
Data Set
Message-ID: <05a396b0-2ad4-4ad1-a27a-a9f9730bf...@joelschwartz.com>
Content-Type: text/plain; charset=utf-8
If your data frame is called df then you can reverse the scoring by doing df$x1
= rev(df$x1).
To do multiple columns, you can do:
df[ , paste0(?x?,1:3)] = lapply(df[ , paste0(?x?,1:3)], rev)
MY RESPONSE: Wow: that's a neat (but somewhat obfuscated) solution. I make R
and R programming a component of my upper level stats courses, but it's hard
for me to imagine teaching all of the idioms that are embedded within it. Are
there cleaner ways to proceed? How can we prepare students to be able to
undertake wrangling of this sort?
Just my $0.02,
Nick
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