flint-sys 0.9.0

Bindings to the FLINT C library
Documentation 
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

/*
    Copyright (C) 2009, 2010 William Hart
    Copyright (C) 2009, 2010 Andy Novocin
    Copyright (C) 2014 Abhinav Baid

    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.h"
#include "fmpz_mat.h"
#include "fmpz_lll.h"

int
fmpz_lll_shift(const fmpz_mat_t B)
{
    int i, n = B->c;
    int shift = 0;
    for (i = 0; i < B->r; i++)
    {
        int j;
        for (j = n - 1; j >= i + shift + 1 && fmpz_is_zero(fmpz_mat_entry(B, i, j)); j--) ;

        if (shift < j - i)
            shift = j - i;
    }

    return shift;
}