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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 "ca_mat.h"
#include "ca_poly.h"
void
_ca_mat_charpoly(ca_ptr cp, const ca_mat_t mat, ca_ctx_t ctx)
{
if (ca_mat_nrows(mat) <= 2)
{
_ca_mat_charpoly_berkowitz(cp, mat, ctx);
}
else
{
/*
ca_field_ptr K;
K = _ca_mat_same_field(mat, ctx);
if (0 && K != NULL && CA_FIELD_IS_NF(K))
{
if (_ca_mat_charpoly_danilevsky(cp, mat, ctx))
return;
}
*/
_ca_mat_charpoly_berkowitz(cp, mat, ctx);
}
}
void ca_mat_charpoly(ca_poly_t cp, const ca_mat_t mat, ca_ctx_t ctx)
{
if (mat->r != mat->c)
{
flint_throw(FLINT_ERROR, "Exception (ca_mat_charpoly). Non-square matrix.\n");
}
ca_poly_fit_length(cp, mat->r + 1, ctx);
_ca_poly_set_length(cp, mat->r + 1, ctx);
_ca_mat_charpoly(cp->coeffs, mat, ctx);
}