Re: [R] Testing if all elements are equal in a vector/matrix

From: Doran, Harold <HDoran_at_air.org>
Date: Tue 30 Aug 2005 - 05:49:20 EST


See ?identical

-----Original Message-----
From: r-help-bounces@stat.math.ethz.ch [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Vincent Goulet Sent: Monday, August 29, 2005 3:35 PM
To: r-help@stat.math.ethz.ch
Subject: [R] Testing if all elements are equal in a vector/matrix

Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me.

> x <- rep(1, 10)
> all(x == x[1]) # == operator does not provide for small differences
[1] TRUE
> isTRUE(all.equal(x, rep(x[1], length(x)))) # ugly
[1] TRUE Best,

Vincent

--
  Vincent Goulet, Associate Professor
  École d'actuariat
  Université Laval, Québec 
  Vincent.Goulet_at_act.ulaval.ca   http://vgoulet.act.ulaval.ca

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Received on Tue Aug 30 06:00:20 2005

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