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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Pass column by reference
- From: Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>
- Date: Fri, 21 May 2010 12:04:46 +0200
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You have two options:
a) declare a template function (that will take vectors as well as
col/row expressions)
template <typename Derived>
void putSomethingInVector(MatrixBase<Derived>& data {}
b) explicitly allows this for MatrixXf columns only by utilizing
Matrix typedefs for special expressions (here ColXpr)
void putSomethingInVector( MatrixXf::ColXpr& data) {}
I hope I did not make any mistake since I did not test, but that's how
it should be working.
- Hauke
On Fri, May 21, 2010 at 11:57 AM, Carlos Becker <carlosbecker@xxxxxxxxx> wrote:
> Hi everyone, I was wondering if it is possible to do something like this:
> void putSomethingInVector( VectorXf &data ) { work with data and modify it;
> }
> ---------------------------------------------------------------------
> MatrixXf myMatrix(100,100);
> putSomethingInVector( myMatrix.col(4) );
> ---------------------------------------------------------------------
> I know it is not possible like that, but is there any way? or .col() returns
> a read-only reference? I was looking for something like colRef() but no luck
> Thanks!
> Carlos