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Ublas : |
Subject: Re: [ublas] How to instantiate ublas vector from std::vector
From: Jeremy Conlin (jeremit0_at_[hidden])
Date: 2009-04-13 21:47:02
On Mon, Apr 13, 2009 at 2:36 PM, James C. Sutherland <
James.Sutherland_at_[hidden]> wrote:
> I would like to avoid copying the data. That could probably be done, but
>>> would not be a great solution.
>>>
>>>
>> Have a look at array adaptors. For example,
>>
>> typedef boost::numeric::ublas::shallow_array_adaptor<double>
>> ArrayAdaptor;
>> typedef boost::numeric::ublas::vector<double,ArrayAdaptor> VecType;
>>
>> vector<double> fieldValues;
>> // ... initialize fieldValues ...
>>
>> VecType vec( npts, ArrayAdaptor(npts,fieldValues) );
>> vector<double>::iterator ival = fieldValues.begin();
>> for( VecType::iterator i=vec.begin(); i!=vec.end(); ++i, ++ival ){
>> *i = *ival;
>> }
>>
>
> Thanks for the suggestion, but how is this any different than copying the
> data?
>
> In this case, the VecType object does not actually copy the data.
>
Oh, well then this might just do it. Thanks for the pointer.
Jeremy