70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2012 Fredrik Johansson
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******************************************************************************/
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#include "fmpz_mat.h"
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#define E fmpz_mat_entry
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void
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fmpz_mat_sqr(fmpz_mat_t B, const fmpz_mat_t A)
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{
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slong n = A->r;
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if (n == 0)
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{
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return;
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}
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else if (n == 1)
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{
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fmpz_mul(E(B, 0, 0), E(A, 0, 0), E(A, 0, 0));
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}
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else if (n == 2)
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{
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fmpz_t t, u;
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fmpz_init(t);
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fmpz_init(u);
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fmpz_add(t, E(A, 0, 0), E(A, 1, 1));
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fmpz_mul(u, E(A, 0, 1), E(A, 1, 0));
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fmpz_mul(E(B, 0, 0), E(A, 0, 0), E(A, 0, 0));
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fmpz_add(E(B, 0, 0), E(B, 0, 0), u);
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fmpz_mul(E(B, 1, 1), E(A, 1, 1), E(A, 1, 1));
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fmpz_add(E(B, 1, 1), E(B, 1, 1), u);
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fmpz_mul(E(B, 0, 1), E(A, 0, 1), t);
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fmpz_mul(E(B, 1, 0), E(A, 1, 0), t);
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fmpz_clear(t);
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fmpz_clear(u);
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}
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else
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{
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fmpz_mat_mul(B, A, A);
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}
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}
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