(C++) UblasMatrixExample1

 

 

boost::numeric::ublas::matrix example 1: matrix creation, read and write to elements is a Boost.uBLAS library example.

 

• Download the Qt Creator project 'CppUblasMatrixExample1' (zip)

Technical facts

 

Operating system(s) or programming environment(s)

• Lubuntu 15.04 (vivid)

IDE(s):

• Qt Creator 3.1.1

Project type:

• Console application

C++ standard:

• C++98

Compiler(s):

• G++ 4.9.2

Libraries used:

• STL: GNU ISO C++ Library, version 4.9.2

 

 

 

 

 

Qt project file: ./CppUblasMatrixExample1/CppUblasMatrixExample1.pro

 

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

 

 

 

 

 

./CppUblasMatrixExample1/main.cpp

 

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#include <iostream> #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/io.hpp> int main() {   const int n_cols = 2;   const int n_rows = 3;   {     boost::numeric::ublas::matrix<int> m(n_rows,n_cols);     assert(n_rows == static_cast<int>(m.size1()));     assert(n_cols == static_cast<int>(m.size2()));     for (int y = 0; y != n_rows; ++y)     {       for (int x = 0; x != n_cols; ++x)       {         m(y,x) = (y * 10) + x;       }     }     std::cout << m << std::endl;     assert(m(0,0) ==  0); assert(m(0,1) ==  1);     assert(m(1,0) == 10); assert(m(1,1) == 11);     assert(m(2,0) == 20); assert(m(2,1) == 21);   }   {     boost::numeric::ublas::matrix<int,boost::numeric::ublas::column_major> m(n_cols,n_rows);     assert(n_cols == static_cast<int>(m.size1()));     assert(n_rows == static_cast<int>(m.size2()));     for (int x = 0; x != n_cols; ++x)     {       for (int y = 0; y != n_rows; ++y)       {         m(x,y) = (y * 10) + x;       }     }     std::cout << m << std::endl;     assert(m(0,0) ==  0); assert(m(1,0) ==  1);     assert(m(0,1) == 10); assert(m(1,1) == 11);     assert(m(0,2) == 20); assert(m(1,2) == 21);   } } /* [3,2]((0,1),(10,11),(20,21)) [2,3]((0,10,20),(1,11,21)) */