[R] odd behaviour of identical

[jim holtman]

If you want them to be identical, then you have to explicitly assign
an integer to the vector so that conversion is not done:

> x = 1:10
> y = 1:10
>
> all.equal(x,y)
[1] TRUE
>
> identical(x,y)
[1] TRUE
>
>
> y[11] = 11L
> y = y[1:10]
>
> all.equal(x,y)
[1] TRUE
>
> identical(x,y)
[1] TRUE
>


On Sun, Oct 26, 2008 at 6:39 PM, Wacek Kusnierczyk
<Waclaw.Marcin.Kusnierczyk at idi.ntnu.no> wrote:
> given what ?identical says, i find the following odd:
>
> x = 1:10
> y = 1:10
>
> all.equal(x,y)
> [1] TRUE
> identical(x,y)
> [1] TRUE
>
> y[11] = 11
> y = y[1:10]
>
> all.equal(x,y)
> [1] TRUE
> identical(x,y)
> [1] FALSE
>
> y
> [1] 1 2 3 4 5 6 7 8 9 10
> length(y)
> [1] 10
>
>
> looks like a bug.
>
> platform       i686-pc-linux-gnu
> arch           i686
> os             linux-gnu
> system         i686, linux-gnu
> status
> major          2
> minor          7.0
> year           2008
> month          04
> day            22
> svn rev        45424
> language       R
> version.string R version 2.7.0 (2008-04-22)
>
>
> vQ
>
> --
> -------------------------------------------------------------------------------
> Wacek Kusnierczyk, MD PhD
>
> Email: waku at idi.ntnu.no
> Phone: +47 73591875, +47 72574609
>
> Department of Computer and Information Science (IDI)
> Faculty of Information Technology, Mathematics and Electrical Engineering (IME)
> Norwegian University of Science and Technology (NTNU)
> Sem Saelands vei 7, 7491 Trondheim, Norway
> Room itv303
>
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> Room 231.05.060
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?