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/*
Copyright (C) 2020 Fredrik Johansson
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 "perm.h"
#include "ca_mat.h"
/* todo: different algorithms... */
int
ca_mat_rank(slong * rank, const ca_mat_t A, ca_ctx_t ctx)
{
slong n, m;
slong * P;
int success;
ca_mat_t T;
n = ca_mat_nrows(A);
m = ca_mat_ncols(A);
if (n == 0 || m == 0)
{
*rank = 0;
return 1;
}
ca_mat_init(T, n, m, ctx);
P = _perm_init(n);
success = ca_mat_lu(rank, P, T, A, 0, ctx);
ca_mat_clear(T, ctx);
_perm_clear(P);
return success;
}