From: "baptiste Auguié" <ba208@...>
Date: 2007-07-07T04:57:07+09:00
Subject: Re: simple question on rbgsl vectors

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Thanks for the reply, although I'm very confused now.


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 =20=

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 ]


This is most annoying as I cannot do anything useful with such behavior.

irb 0.9.5 (05/04/13)
ruby 1.8.6 (2007-03-13 patch level 0) [i386 linux]



Thanks,

baptiste


On 4 Jul 2007, at 15:03, Axel Etzold wrote:

> Dear Baptiste,
>
> you can get reference for the gsl bindings for ruby
> here:
>
> http://rb-gsl.rubyforge.org/ref.html .
>
>
>> oldVector.get(3,4,5) returns the first 3 elements, where I would
>> expect the 2nd, 3d and 4th.
>
> oldVector.get([3,4,5])  worked for me - I'm not quite sure
> why this:
>
>> oldVector.get(3,4,5) returns the first 3 elements
>
> happens...
>
>
>>
>> I've had to do a twisted version of this using arrays and lists,
>>
>> a2=3D[]
>> (0..200).step(10) {|i|  a2 << a[i] }
>>
>> I find it very inefficient and annoying, plus I do need to use
>> vectors rather than arrays and lists and do not really know how to
>> convert between these three :(
>
> You'll find info about that on the website given above.
>
>
>>
>>
>> Oh, and just a quick question: how can i do two instructions in one
>> block ? I have to repeat the same instructions over and over like
>> shown below...
>
> You can use the same index several times:
>
>  (0..200).step(10) {|i|  a2 << a[i] ; b2<<b[i] }
>
> Best regards,
>
> Axel
>
> --=20
> Psssst! Schon vom neuen GMX MultiMessenger geh=F6rt?
> Der kanns mit allen: http://www.gmx.net/de/go/multimessenger
>

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