Message-ID: <70222FFE-1153-4B1D-ADB3-3E335C02A3BF@soc.soton.ac.uk>
Date: 2005-08-30T10:16:20Z
From: robin hankin
Subject: Testing if all elements are equal in a vector/matrix
In-Reply-To: <200508291535.21230.vincent.goulet@act.ulaval.ca>
Hi
library(magic)
?minmax
[
the basic idea is min(x) == max(x)
]
best wishes
Robin
On 29 Aug 2005, at 20:35, Vincent Goulet wrote:
>
> 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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--
Robin Hankin
Uncertainty Analyst
National Oceanography Centre, Southampton
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