Starting the the error, which is showed by building the following code: Testfile.cpp:27:41: error:

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Asked: June 11, 20262026-06-11T12:30:31+00:00 2026-06-11T12:30:31+00:00

Starting the the error, which is showed by building the following code: Testfile.cpp:27:41: error:

0

Starting the the error, which is showed by building the following code:

Testfile.cpp:27:41: error: variable ‘boost::numeric::ublas::matrix_column<boost::numeric::ublas::bounded_matrix<double, 2u, 2u> > op1’ has initialiser but incomplete type.

Please condider the following code:

//! System includes
#include <iostream>
#include <fstream>
//! Boost includes
#include <boost/lexical_cast.hpp>
#include <boost/integer/static_min_max.hpp>

#include <boost/numeric/ublas/vector.hpp>
#include <boost/numeric/ublas/matrix.hpp>
#include <boost/array.hpp>

int main( )
{
    namespace ublas = boost::numeric::ublas;

    typedef ublas::bounded_matrix<double,2,2>       MatDofDdim;
    typedef ublas::bounded_vector<double,2>             VecDof;

    MatDofDdim op;
    for(int i=0;i<2;i++){
        for(int j=0;j<2;j++){
            op(i,j)=i+j;
        }
    }

    //VecDof op1;
    ublas::matrix_column<MatDofDdim> op1 ( op, 1 ) ;

    //VecDof op1( ublas::matrix_column<MatDofDdim>( op, 1 ));
    return 0;
}

I also tried an different approach with comment the line "ublas::matrix_column<MatDofDdim> op1 ( op, 1 ) ;" and with uncomment the preceeding and following line.

Then it says:
Testfile.cpp:29:48: error: redeclaration of ‘VecDof op1’ Testfile.cpp:26:9: error: ‘VecDof op1’ previously declared here Testfile.cpp:29:54: error: invalid use of incomplete type ‘struct boost::numeric::ublas::matrix_column<boost::numeric::ublas::bounded_matrix<double, 2u, 2u> >’ /usr/include/boost/numeric/ublas/fwd.hpp:75:11: error: declaration of ‘struct boost::numeric::ublas::matrix_column<boost::numeric::ublas::bounded_matrix<double, 2u, 2u> >’

I use eclipse in ubuntu with g++.