mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
6bf072eb59
This will allow us to not loose the julia session on error. See also https://github.com/wbhart/flint2/pull/243
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
/*
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Copyright (C) 2016 Arb authors
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This file is part of Arb.
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Arb is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "bool_mat.h"
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void
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bool_mat_pow_ui(bool_mat_t B, const bool_mat_t A, ulong exp)
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{
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slong d;
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if (!bool_mat_is_square(A))
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{
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flint_printf("bool_mat_pow_ui: a square matrix is required!\n");
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flint_abort();
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}
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if (bool_mat_is_empty(A))
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return;
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d = bool_mat_nrows(A);
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if (exp <= 2 || d <= 1)
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{
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if (exp == 0)
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{
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bool_mat_one(B);
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}
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else if (d == 1)
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{
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bool_mat_set_entry(B, 0, 0, bool_mat_get_entry(A, 0, 0));
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}
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else if (exp == 1)
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{
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bool_mat_set(B, A);
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}
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else if (exp == 2)
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{
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bool_mat_sqr(B, A);
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}
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}
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else
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{
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slong i;
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bool_mat_t T, U;
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bool_mat_init(T, d, d);
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bool_mat_set(T, A);
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bool_mat_init(U, d, d);
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for (i = ((slong) FLINT_BIT_COUNT(exp)) - 2; i >= 0; i--)
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{
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bool_mat_sqr(U, T);
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if (exp & (WORD(1) << i))
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bool_mat_mul(T, U, A);
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else
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bool_mat_swap(T, U);
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}
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bool_mat_swap(B, T);
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bool_mat_clear(T);
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bool_mat_clear(U);
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}
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}
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