dat <- within(dat, {
X2 <- ifelse(X2 > 50, 100-X2, X2)
X3 <- ifelse(X3 > 50, 100-X3, X3)
})
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of joe82
Sent: Tuesday, 22 March 2011 7:40 AM
To: r-help@r-project.org
Subject: [R] How to substract a valur from dataframe with condition
Hello All,
I need help with my dataframe, it is big but here I am using a small table
as an example.
My dataframe df looks like:
X1 X2 X3
1 2011-02 0.00 96.00
2 2011-02 0.00 2.11
3 2011-02 2.00 3.08
4 2011-02 0.06 2.79
5 2011-02 0.00 96.00
6 2011-02 0.00 97.00
7 2011-02 0.08 2.23
I want values in columns X2 and X3 to be checked if they are greater than
50, if yes, then subtract from '100'
df should look like:
X1 X2 X3
1 2011-02 0.00 4.00
2 2011-02 0.00 2.11
3 2011-02 2.00 3.08
4 2011-02 0.06 2.79
5 2011-02 0.00 4.00
6 2011-02 0.00 3.00
7 2011-02 0.08 2.23
Please help, I will really appreciate that.
Thanks,
Joe
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