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

From: F Duan <f.duan_at_yale.edu>
Date: Tue 20 Jul 2004 - 05:08:57 EST


Thanks for all your quick answers.

That's exactly what I want.

Best,

Frank

-----Original Message-----
From: Berton Gunter [mailto:gunter.berton@gene.com] Sent: Monday, July 19, 2004 14:32
To: F Duan; R-Help
Subject: Re: [R] How to compare X1 = X2 = ... = Xn?

ink1">ink1">How about:

X<-as.matrix(yourframe)
apply(X,2, '==',X[,1])%*%rep(1,ncol(X)) == ncol(x)

avoiding the rowwise apply overhead?

Cheers,

Bert Gunter

Non-Clinical Biostatistics
Genentech
MS: 240B
Phone: 650-467-7374

"The business of the statistician is to catalyze the scientific learning process."

> 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?
>
>
>
> 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 05:19:25 2004

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