Re: [Boost-Users] Problem with matrix_expressions

From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2002-11-14 02:58:28

On Thursday 14 November 2002 02:51, agiatojon wrote:
> Hello all,
>
> I am trying to compile the following code snippet from the
> documentation of matrix_expressions in which two matrices are used
> to display the use of addition and subtraction operations.  I am not
> really sure how to post the error messages as there are literally
> hundreds of them, so here is the code as I am am pretty sure this is
> going to be one of those well known bugs kind of things.  Compiled
> using VS.NET, debug mode.
>
> #include <iostream>

// include matrix.hpp instead of matrix_expression.hpp
#include <boost/numeric/ublas/matrix.hpp>

// if you want to stream ublas matrices or vectors, also
#include <boost/numeric/ublas/io.hpp>

>
> int main()
> {
>     using namespace boost::numeric::ublas;
>
>     matrix<double> m1(3, 3), m2(3, 3);
>
>     for(int i = 0; i < std::min(m1.size1(), m2.size1()); ++i)
>         for(int j = 0; j < std::min(m1.size2(), m2.size2()); ++j)
>             m1(i, j) = m2(i, j) = 3 * i + j;
>
>     std::cout << m1 + m2 << std::endl;
>     std::cout << m1 - m2 << std::endl;
>
>     std::cin.get();
>     return EXIT_SUCCESS;
> }

With these two changes, it should work (at least on my linux box)