Re: [R] How to compare X1 = X2 = ... = Xn?

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Tue 20 Jul 2004 - 04:06:16 EST

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.
>

One idea is:

   apply(apply(X, 2, "==", X[,1]), 1, all)

but there may be better solutions.

Uwe Ligges

>
> How to do that in a quick way instead of doing (n choose 2) comparisons?
>
>
>
> Thank you,
>
>
>
> Frank
>
>
> [[alternative HTML version deleted]]
>
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R-help@stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jul 20 04:19:50 2004