(C++) boost::numeric::ublas::matrix example 2: transposition

boost::numeric::ublas::matrix example 2: transposition is a Boost.uBLAS library example.

Download the Qt Creator project 'CppUblasMatrixExample2' (zip)

Technical facts

Application type(s)

Desktop application

Operating system(s) or programming environment(s)

Lubuntu 12.10 (quantal)

Qt Creator 2.5.2

Console application

C++98

G++ 4.7.2

Libraries used:

STL: GNU ISO C++ Library, version 4.7.2

Qt project file: CppUblasMatrixExample2.pro

`TEMPLATE = app CONFIG += console CONFIG -= qt SOURCES += main.cpp`

main.cpp

#include <boost/numeric/ublas/matrix.hpp> const boost::numeric::ublas::matrix<int> CreateMatrix(const int n_cols, const int n_rows) { boost::numeric::ublas::matrix<int> m(n_rows,n_cols); //y-x-ordered for (int y = 0; y != n_rows; ++y) { for (int x = 0; x != n_cols; ++x) { m(y,x) = (y * 10) + x; } } return m; } int main() { const int n_cols = 3; const int n_rows = 2; const boost::numeric::ublas::matrix<int> m = CreateMatrix(n_cols,n_rows); //boost::numeric::ublas::matrix is y-x-ordered assert(m(0,0) == 0); assert(m(0,1) == 1); assert(m(0,2) == 2); assert(m(1,0) == 10); assert(m(1,1) == 11); assert(m(1,2) == 12); //Transpose const boost::numeric::ublas::matrix<int> n = boost::numeric::ublas::trans(m); assert(n(0,0) == 0); assert(n(0,1) == 10); assert(n(1,0) == 1); assert(n(1,1) == 11); assert(n(2,0) == 2); assert(n(2,1) == 12); }