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/*
Copyright (C) 2016 Arb authors
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "bool_mat.h"
/* Warshall's algorithm */
void
bool_mat_transitive_closure(bool_mat_t dest, const bool_mat_t src)
{
slong k, i, j, dim;
if (bool_mat_nrows(dest) != bool_mat_nrows(src) ||
bool_mat_ncols(dest) != bool_mat_ncols(src))
{
flint_throw(FLINT_ERROR, "bool_mat_transitive_closure: incompatible dimensions\n");
}
dim = bool_mat_nrows(src);
if (dim != bool_mat_ncols(src))
{
flint_throw(FLINT_ERROR, "bool_mat_transitive_closure: a square matrix is required!\n");
}
bool_mat_set(dest, src);
for (k = 0; k < dim; k++)
{
for (i = 0; i < dim; i++)
{
for (j = 0; j < dim; j++)
{
if (!bool_mat_get_entry(dest, i, j))
{
bool_mat_set_entry(dest, i, j, (
bool_mat_get_entry(dest, i, k) &
bool_mat_get_entry(dest, k, j)));
}
}
}
}
}