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
43
44
45
46
47
48
49
/*
Copyright (C) 2008 2009 William Hart
Copyright (C) 2008 Richard Howell-Peak
Copyright (C) 2008 Martin Albrecht
Copyright (C) 2010 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 "nmod_mat.h"
void
nmod_mat_window_init(nmod_mat_t window, const nmod_mat_t mat,
slong r1, slong c1, slong r2, slong c2)
{
slong i;
window->entries = NULL;
if (r2 > r1)
window->rows = (ulong **) flint_malloc((r2 - r1) * sizeof(ulong *));
else
window->rows = NULL;
if (mat->c > 0)
{
for (i = 0; i < r2 - r1; i++)
window->rows[i] = mat->rows[r1 + i] + c1;
} else
{
for (i = 0; i < r2 - r1; i++)
window->rows[i] = NULL;
}
window->r = r2 - r1;
window->c = c2 - c1;
window->mod = mat->mod;
}
void
nmod_mat_window_clear(nmod_mat_t window)
{
if (window->r > 0)
flint_free(window->rows);
}