On 2011-03-21 14:39, joe82 wrote:
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
One more way:
d <- transform(d,
X1 = pmin(X1, 100 - X1),
X2 = pmin(X2, 100 - X2))
[or use within() in place of transform()].
Peter Ehlers
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