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## Copyright (C) 2009 Jaroslav Hajek <highegg@gmail.com>
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## This program is free software; you can redistribute it and/or modify it under
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## the terms of the GNU General Public License as published by the Free Software
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## Foundation; either version 3 of the License, or (at your option) any later
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## This program is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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## You should have received a copy of the GNU General Public License along with
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## this program; if not, see <http://www.gnu.org/licenses/>.
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## @deftypefn{Function File} rolldices (@var{n})
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## @deftypefnx{Function File} rolldices (@var{n}, @var{nrep}, @var{delay})
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## Returns @var{n} random numbers from the 1:6 range, displaying a visual selection
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## @var{nrep} sets the number of rolls, @var{delay} specifies time between
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## successive rolls in seconds. Default is nrep = 25 and delay = 0.1.
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## Requires a terminal with ANSI escape sequences enabled.
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function numbers = rolldices (n, nrep = 25, delay = .1)
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persistent matrices = getmatrices ();
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screen_cols = getenv ("COLUMNS");
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if (isempty (screen_cols))
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screen_cols = str2num (screen_cols);
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dices_per_row = floor ((screen_cols-1) / 7);
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oldpso = page_screen_output (0);
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m = min (n, dices_per_row);
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puts (char ([27, 91, 51, 70]));
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nums = ceil (6 * rand (1, m));
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disp (matrices(:,:,nums)(:,:));
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numbers = [numbers, nums];
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unwind_protect_cleanup
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page_screen_output (oldpso);
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function matrices = getmatrices ()
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lbrk = [27, 91, 55, 109](ones (1, 3), :);
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rbrk = [27, 91, 50, 55, 109](ones (1, 3), :);
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spcs = [32, 32; 32, 32; 32, 32];
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" @ @@ @@ @@ @"], [3, 5, 6]);
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matrices = mat2cell (dchrs, 3, 5, ones (1, 6));
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matrices = cellfun (@(mat) [spcs, lbrk, mat, rbrk], matrices, "UniformOutput", false);
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matrices = cat (3, matrices{:});