Hi Doran
The documentation for isTRUE reads 'isTRUE(x)' is an abbreviation of
'identical(TRUE,x)' so actually Vincent's solutions is "cleaner" than using
identical :)
Cheers
Francisco
From: "Doran, Harold" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>, <r-help@stat.math.ethz.ch>
Subject: Re: [R] Testing if all elements are equal in a vector/matrix
Date: Mon, 29 Aug 2005 15:49:20 -0400
See ?identical
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] 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
[EMAIL PROTECTED] http://vgoulet.act.ulaval.ca
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