[R] How to compare X1 = X2 = ... = Xn?
bitwrit at ozemail.com.au
Tue Jul 20 11:49:27 CEST 2004
F Duan wrote:
> Dear All,
> I have a data frame with n columns: X1, X2, ., Xn. Now I want to create a
> new column: if X1 = X2 = . = Xn, the value is 1; Otherwise, the value is 0.
> How to do that in a quick way instead of doing (n choose 2) comparisons?
Assuming that the Xs are numeric, and your data frame is named data.df:
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