Re: [ublas] Support for more general ranges

Subject: Re: [ublas] Support for more general ranges
From: oswin krause (oswin.krause_at_[hidden])
Date: 2013-05-20 12:51:54

Hi,

take a look at vector_indirect.

On 20.05.2013 18:49, gsermaid wrote:
> Hi all,
>
> I would like to ask if there is any way to create a vector proxy based 
> on a general range of indices. For example, if I have
> a vector
>
> vector<unsigned> x(4);
> x <<= 1,2,3,4;
>
> and a vector of indices
>
> vector<size_t> k(2);
> k <<= 0,3;
>
> I would like to be able to create a vector proxy as follows
>
> vector_proxy<unsigned> mysubvector(x, k);
>
> with the property that
>
> mysubvector[i] = x[k[i]].
>
> I know I can create a simple new class which provides this 
> functionality but ideally I also want to have
> all the useful iterator functionality and mathematical operations 
> supported by a typical ublas vector. Is this currently supported? If 
> not, is there an easy way to
> implement it and have all the functionality that ublas offer? Finally, 
> do you think something like this could be included in future versions?
>
> Regards,
> Giorgos
>
>
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