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/*
Copyright (C) 2022 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 "gr.h"
#include "gr_mat.h"
int
gr_mat_inv(gr_mat_t res, const gr_mat_t mat, gr_ctx_t ctx)
{
gr_mat_t T;
int status = GR_SUCCESS;
slong n = mat->r;
if (n != mat->c)
return GR_DOMAIN;
if (n == 0)
return GR_SUCCESS;
if (n == 1)
return gr_inv(gr_mat_entry_ptr(res, 0, 0, ctx), gr_mat_entry_srcptr(mat, 0, 0, ctx), ctx);
gr_mat_init(T, n, n, ctx);
status |= gr_mat_one(T, ctx);
status |= gr_mat_nonsingular_solve(res, mat, T, ctx);
gr_mat_clear(T, ctx);
return status;
}