assemble.cpp File Reference
Example programs and code

C++ example based on <rsb.hpp> assembling RsbMatrix by pieces. More...

## Functions

auto | main () -> int

## Detailed Description

C++ example based on <rsb.hpp> assembling RsbMatrix by pieces.

Author
  Michele Martone

/*
Copyright (C) 2021-2021 Michele Martone
This file is part of librsb.
librsb is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
librsb is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public
License along with librsb; see the file COPYING.
If not, see <http://www.gnu.org/licenses/>.
*/
/*!
\ingroup rsb_doc_examples
\file
@author Michele Martone
@brief C++ example based on <rsb.hpp> assembling RsbMatrix by pieces.
\include assemble.cpp
*/
#include <rsb.hpp>
#include <vector>
#include <cassert>
#include <array>
using namespace rsb;
auto main() -> int {
RsbLib rsblib;
/*! [snip__RsbMatrix_Assemble] */
const rsb_coo_idx_t nrA { 4 }, ncA { 4 };
RsbMatrix<double> mtx(nrA,ncA); // begin matrix assembly
// insert elements of a tridiagonal matrix, one by one
for (auto i = 0; i < nrA; ++i )
for (auto j = i-1; j <= i+1; ++j )
if ( i >= 0 && i < nrA )
if ( j >= 0 && j < ncA )
mtx.set_val((i+1)*100+(j+1),i,j); // add entry
mtx.close(); // finish matrix assembly
assert(mtx.nnz() == 3 * nrA - 2);
/*! [snip__RsbMatrix_Assemble] */
mtx.file_save(nullptr); // print out
}
main
auto main() -> int
Definition assemble.cpp:38
RsbLib
Class initializing/finalizing librsb state.
Definition rsb.hpp:272
RsbMatrix
Represent a sparse matrix in RSB format by means of librsb.
Definition rsb.hpp:532
rsb
Definition rsb.F90:11
rsb_coo_idx_t
signed int rsb_coo_idx_t
Definition rsb.h:349
rsb.hpp
Classes RsbLib and RsbMatrix provide native C++ access to librsb.

## Function Documentation

## main()

auto main | ( | void |  | ) | -> int

[snip__RsbMatrix_Assemble]

[snip__RsbMatrix_Assemble]