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https://github.com/vale981/arb
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42 lines
847 B
C
42 lines
847 B
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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void
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arb_mat_bound_frobenius_norm(mag_t b, const arb_mat_t A)
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{
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slong i, j, r, c;
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mag_t t;
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r = arb_mat_nrows(A);
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c = arb_mat_ncols(A);
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mag_zero(b);
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if (r == 0 || c == 0)
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return;
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mag_init(t);
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for (i = 0; i < r; i++)
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{
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for (j = 0; j < c; j++)
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{
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arb_get_mag(t, arb_mat_entry(A, i, j));
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mag_addmul(b, t, t);
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}
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}
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mag_sqrt(b, b);
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mag_clear(t);
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}
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