mirror of
https://github.com/vale981/arb
synced 2025-03-04 17:01:40 -05:00
6bf072eb59
This will allow us to not loose the julia session on error. See also https://github.com/wbhart/flint2/pull/243
67 lines
1.4 KiB
C
67 lines
1.4 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 "arb_mat.h"
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int
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arb_mat_spd_inv(arb_mat_t X, const arb_mat_t A, slong prec)
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{
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slong n;
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arb_mat_t L;
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int result;
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if (!arb_mat_is_square(A))
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{
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flint_printf("arb_mat_spd_inv: a square matrix is required\n");
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flint_abort();
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}
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if (arb_mat_nrows(X) != arb_mat_nrows(A) ||
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arb_mat_ncols(X) != arb_mat_ncols(A))
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{
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flint_printf("arb_mat_spd_inv: incompatible dimensions\n");
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flint_abort();
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}
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if (arb_mat_is_empty(A))
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return 1;
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n = arb_mat_nrows(A);
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if (n == 1)
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{
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if (arb_is_positive(arb_mat_entry(A, 0, 0)))
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{
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arb_inv(arb_mat_entry(X, 0, 0), arb_mat_entry(A, 0, 0), prec);
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return 1;
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}
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else
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{
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return 0;
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}
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}
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arb_mat_init(L, n, n);
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arb_mat_set(L, A);
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if (_arb_mat_cholesky_banachiewicz(L, prec))
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{
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arb_mat_inv_cho_precomp(X, L, prec);
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result = 1;
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}
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else
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{
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result = 0;
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}
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arb_mat_clear(L);
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return result;
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}
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