Re: [Boost-Users] Problem with matrix_expressions

From: Jon Agiato (JonAgiato_at_[hidden])
Date: 2002-11-14 07:10:22

----- Original Message ----- 
  From: Toon Knapen 
  To: Boost-Users_at_[hidden] 
  Sent: Thursday, November 14, 2002 2:58 AM
  Subject: Re: [Boost-Users] Problem with matrix_expressions

  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)

  Many thanks to Fresl and Knapen!  I will get the hang of this sooner or later.

  Jon Agiato
  JonAgiato_at_[hidden]

[Non-text portions of this message have been removed]