1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/*
Copyright (C) 2023 Jean Kieffer
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 "fmpz_mat.h"
#include "acb_theta.h"
int
sp2gz_is_correct(const fmpz_mat_t mat)
{
slong r = fmpz_mat_nrows(mat);
slong c = fmpz_mat_ncols(mat);
slong g = r / 2;
fmpz_mat_t J, test;
int res;
if (r != c || r % 2 != 0)
{
return 0;
}
fmpz_mat_init(J, 2 * g, 2 * g);
fmpz_mat_init(test, 2 * g, 2 * g);
sp2gz_j(J);
fmpz_mat_transpose(test, mat);
fmpz_mat_mul(test, test, J);
fmpz_mat_mul(test, test, mat);
res = fmpz_mat_equal(test, J);
fmpz_mat_clear(J);
fmpz_mat_clear(test);
return res;
}