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

Robin Hankin
Tue, 30 Aug 2005 10:16:20 -0000

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
European Way, Southampton SO14 3ZH, UK
  tel  023-8059-7743