Hi,

I'm creating a helper function to append a dense matrix at the bottom of another one. This is the code:

Code: Select all

   template<class Derived>
   void v_append(Eigen::DenseBase<Derived> &data, const Eigen::DenseBase<Derived> &append)
   {
      assert(data.cols() == append.cols());
      int initial_length = data.rows();
      data.derived().conservativeResize(initial_length + append.rows(), NoChange);
      data.block(initial_length, 0, append.rows(), append.cols()) = append;
   }


This seems to work for Matrixes of more than one column and rows.
But when I use it with data and append being ArrayXi I get a non very clear compiler error, which I assume it's down to conservativeResize having a single parameter for column Vectors.
How can I change this code so that it can work for both Matrixes (of more than one column and rows) and column Vectors?

Please post the error you get. As a side note instead of block, you can use data.bottomRows(append.rows()) = append;

The compile error is:

Code: Select all

1>t:\eigen\eigen3.2\eigen\src\core\plainobjectbase.h(341) : error C2661: 'Eigen::internal::conservative_resize_like_impl<Derived>::run' : no overloaded function takes 3 arguments
1>        with
1>        [
1>            Derived=Eigen::Array<int,-1,1>
1>        ]
1>        t:\eigen\eigen3.2\eigen\src\core\plainobjectbase.h(340) : while compiling class template member function 'void Eigen::PlainObjectBase<Derived>::conservativeResize(__w64 int,__w64 int)'
1>        with
1>        [
1>            Derived=Eigen::Array<int,-1,1>
1>        ]
1>        t:\eigen\eigen3.2\eigen\src\core\array.h(44) : see reference to class template instantiation 'Eigen::PlainObjectBase<Derived>' being compiled
1>        with
1>        [
1>            Derived=Eigen::Array<int,-1,1>
1>        ]
1>        frames_v2.h(42) : see reference to class template instantiation 'Eigen::Array<_Scalar,_Rows,_Cols>' being compiled
1>        with
1>        [
1>            _Scalar=int,
1>            _Rows=-1,
1>            _Cols=1
1>        ]

Compiler is Visual Studio 2008 Express.

alright, this is fixed in the devel branch and backported in 3.2:

https://bitbucket.org/eigen/eigen/commits/eb7573ee22e4/
Changeset: eb7573ee22e4
User: ggael
Date: 2013-10-16 12:07:33
Summary: Allow .conservativeResize(rows,cols) on vectors