Re: [eigen] is MAP oneway ? (urgent)

[Helmut Jarausch <jarausch@xxxxxxxxxxxxxxxxxxx>]

On 24 Jun, Benoit Jacob wrote:
> 2009/6/24 Benoit Jacob <jacob.benoit.1@xxxxxxxxx>:
>> Of course: process takes a VectorXd reference, but D is not a VectorXd.
>>
>> The biggest common denominator between VectorXd and Map<VectorXd> is
>> MatrixBase, so you want process to take a MatrixBase reference:
>>
>> template<typename Derived>
>> void process(const MatrixBase<Derived>& DATA);
> 
> oops, remove the const here.

Thanks, but unfortunately that raises another problem.

In   "void process..."   I have
DATA.segment<2>(ind)+= ...

or

DATA.start<2>()+= ...
which fails now.

So, I need to convert (cast?) a MatrixBase<Derived> object
back to an VectorXd object - but how to?

Thanks for your patience,
Helmut.

-- 
Helmut Jarausch

Lehrstuhl fuer Numerische Mathematik
RWTH - Aachen University
D 52056 Aachen, Germany