From: "baptiste Auguié" <ba208@...>
Date: 2007-07-07T21:08:31+09:00
Subject: Re: simple question on rbgsl vectors

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update: this is apparently a bug in rb-gsl. The author has a patch, =20
it should be fixed in the next version.


On 6 Jul 2007, at 21:35, Gavin Kistner wrote:

> From: baptiste Augui=E9 [mailto:ba208@exeter.ac.uk]
> Sent: Friday, July 06, 2007 1:57 PM
>> Does anybody see this odd behavior:
>>
>> irb(main):001:0> require("rbgsl")
>> =3D> true
>> irb(main):002:0> v =3D GSL::Vector[0..5]
>> =3D> GSL::Vector: [ 0.000e+00 1.000e+00 2.000e+00 3.000e+00 4.000e+00
>> 5.000e+00 ]
>> irb(main):003:0> v[2]
>> =3D> 2.0
>> irb(main):004:0> v[1, 3, 4]
>> =3D> GSL::Vector: [ 0.000e+00 1.000e+00 2.000e+00 ]
>>
>> **** where is should expect ****
>>
>> =3D> GSL::Vector: [ 1.000e+00 3.000e+00 4.000e+00 ]
>
> I've never used GSL, but it looks like it relies on NArray.
> It looks like NArray#[] doesn't do what you expect for the above, =20
> but (maybe) if you did:
>   v[ [1,3,4] ]
> you might get the result you desire.
>

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