ALL: Add flint

external/flint-2.4.3/nmod_mat/solve_vec.c

@@ -0,0 +1,59 @@
+/*=============================================================================
+
+    This file is part of FLINT.
+
+    FLINT is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    FLINT is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FLINT; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+
+=============================================================================*/
+/******************************************************************************
+
+    Copyright (C) 2010,2011 Fredrik Johansson
+
+******************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "flint.h"
+#include "ulong_extras.h"
+#include "nmod_vec.h"
+#include "nmod_mat.h"
+
+int
+nmod_mat_solve_vec(mp_ptr x, const nmod_mat_t A, mp_srcptr b)
+{
+    nmod_mat_t X, B;
+    int result;
+    slong i, m;
+
+    m = A->r;
+
+    if (m == 0)
+        return 1;
+
+    /* This is a bit of a hack. There should be a function to create
+       a window into a vector */
+    nmod_mat_window_init(X, A, 0, 0, m, 1);
+    nmod_mat_window_init(B, A, 0, 0, m, 1);
+
+    for (i = 0; i < m; i++) X->rows[i] = x + i;
+    for (i = 0; i < m; i++) B->rows[i] = (mp_ptr) (b + i);
+
+    result = nmod_mat_solve(X, A, B);
+
+    nmod_mat_window_clear(X);
+    nmod_mat_window_clear(B);
+
+    return result;
+}