[R] How to substract a valur from dataframe with condition

[Bill.Venables at csiro.au]

dat <- within(dat, {
	X2 <- ifelse(X2 > 50, 100-X2, X2)
	X3 <- ifelse(X3 > 50, 100-X3, X3)
})
 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of joe82
Sent: Tuesday, 22 March 2011 7:40 AM
To: r-help at 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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