mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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Copyright (C) 2018 Fredrik Johansson
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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_pascal(arb_mat_t mat, int triangular, slong prec)
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{
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slong R, C, i, j;
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R = arb_mat_nrows(mat);
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C = arb_mat_ncols(mat);
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if (R == 0 || C == 0)
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return;
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if (triangular == 1)
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{
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for (i = 1; i < R; i++)
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for (j = 0; j < i && j < C; j++)
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arb_zero(arb_mat_entry(mat, i, j));
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for (j = 0; j < C; j++)
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arb_one(arb_mat_entry(mat, 0, j));
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for (i = 1; i < R && i < C; i++)
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arb_one(arb_mat_entry(mat, i, i));
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for (i = 1; i < R; i++)
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for (j = i + 1; j < C; j++)
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arb_add(arb_mat_entry(mat, i, j),
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arb_mat_entry(mat, i, j - 1),
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arb_mat_entry(mat, i - 1, j - 1), prec);
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}
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else if (triangular == -1)
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{
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for (i = 0; i < R; i++)
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for (j = i + 1; j < C; j++)
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arb_zero(arb_mat_entry(mat, i, j));
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for (i = 0; i < R; i++)
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arb_one(arb_mat_entry(mat, i, 0));
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for (i = 1; i < R && i < C; i++)
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arb_one(arb_mat_entry(mat, i, i));
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for (i = 2; i < R; i++)
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for (j = 1; j < i && j < C; j++)
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arb_add(arb_mat_entry(mat, i, j),
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arb_mat_entry(mat, i - 1, j - 1),
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arb_mat_entry(mat, i - 1, j), prec);
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}
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else
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{
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for (j = 0; j < C; j++)
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arb_one(arb_mat_entry(mat, 0, j));
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for (i = 1; i < R; i++)
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arb_one(arb_mat_entry(mat, i, 0));
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for (i = 1; i < R; i++)
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for (j = 1; j < C; j++)
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arb_add(arb_mat_entry(mat, i, j),
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arb_mat_entry(mat, i, j - 1),
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arb_mat_entry(mat, i - 1, j), prec);
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}
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}
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