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

Doran, Harold
Mon, 29 Aug 2005 19:49:20 -0000

See ?identical

-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch [mailto:r-help-bounces at
stat.math.ethz.ch] On Behalf Of Vincent Goulet
Sent: Monday, August 29, 2005 3:35 PM
To: r-help at 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
  ??cole d'actuariat
  Universit?? Laval, Qu??bec
  Vincent.Goulet at act.ulaval.ca   http://vgoulet.act.ulaval.ca

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