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/*
Copyright (C) 2018 Tommy Hofmann
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/>.
*/
#ifdef T
#include "templates.h"
int
TEMPLATE(T, mat_inv)(TEMPLATE(T, mat_t) B, TEMPLATE(T, mat_t) A,
const TEMPLATE(T, ctx_t) ctx)
{
TEMPLATE(T, mat_t) I;
slong i, dim;
int result;
dim = A->r;
switch (dim)
{
case 0:
result = 1;
break;
case 1:
if (TEMPLATE(T, is_zero)(TEMPLATE(T, mat_entry)(A, 0, 0), ctx))
{
result = 0;
}
else
{
TEMPLATE(T, inv)(TEMPLATE(T, mat_entry(B, 0, 0)), TEMPLATE(T, mat_entry(A, 0, 0)), ctx);
result = 1;
}
break;
default:
TEMPLATE(T, mat_init)(I, dim, dim, ctx);
for (i = 0; i < dim; i++)
TEMPLATE(T, one)(TEMPLATE(T, mat_entry)(I, i, i), ctx);
result = TEMPLATE(T, mat_solve)(B, A, I, ctx);
TEMPLATE(T, mat_clear)(I, ctx);
}
return result;
}
#endif