STXXL  1.4-dev
examples/containers/matrix1.cpp

This example code is explained in the STXXL Matrix section

/***************************************************************************
* examples/containers/matrix1.cpp
*
* Part of the STXXL. See http://stxxl.sourceforge.net
*
* Copyright (C) 2013 Daniel Feist <[email protected]>
*
* (See accompanying file LICENSE_1_0.txt or copy at
**************************************************************************/
//! [example]
#include <iostream>
int main()
{
// Matrix dimensions
int height = 3;
int width = 3;
int internal_memory = 64 * 1024 * 1024;
const int small_block_order = 32; // must be multiple of matrix valueType in bits
block_schedular_type my_bs(internal_memory);
// Create 3 matrices with given dimensions
matrix_type A(my_bs, height, width);
matrix_type B(my_bs, height, width);
matrix_type C(my_bs, height, width);
typedef matrix_type::row_major_iterator row_iterator;
int i = 0;
// Fill matrix A with values 0,1,2,3,...
for (row_iterator it_A = A.begin(); it_A != A.end(); ++it_A, ++i)
{
*it_A = i;
}
i = 0;
// Fill matrix B with values 0,2,4,8,...
for (row_iterator it_B = B.begin(); it_B != B.end(); ++it_B, ++i)
{
*it_B = i * 2;
}
// Multiply matrix A and B and store result in matrix C
C = A * B;
C.transpose();
// Print out matrix C
for (row_iterator it_C = C.begin(); it_C != C.end(); ++it_C)
{
std::cout << *it_C << " ";
}
return 0;
}
//! [example]