/usr/share/octave/packages/symbolic-2.2.4/digits.m is in octave-symbolic 2.2.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 | %% Copyright (C) 2014, 2015 Colin B. Macdonald
%%
%% This file is part of OctSymPy.
%%
%% OctSymPy is free software; you can redistribute it and/or modify
%% it under the terms of the GNU General Public License as published
%% by the Free Software Foundation; either version 3 of the License,
%% or (at your option) any later version.
%%
%% This software is distributed in the hope that it will be useful,
%% but WITHOUT ANY WARRANTY; without even the implied warranty
%% of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
%% the GNU General Public License for more details.
%%
%% You should have received a copy of the GNU General Public
%% License along with this software; see the file COPYING.
%% If not, see <http://www.gnu.org/licenses/>.
%% -*- texinfo -*-
%% @documentencoding UTF-8
%% @deftypefn {Function File} {@var{n} =} digits ()
%% @deftypefnx {Function File} {} digits (@var{n})
%% @deftypefnx {Function File} {@var{oldn} =} digits (@var{n})
%% Get/set number of digits used in variable precision arith.
%%
%% Examples:
%% @example
%% @group
%% >> n_orig = digits(7);
%% >> vpa('pi')
%% @result{} (sym) 3.141593
%%
%% >> digits(42)
%% >> vpa('pi')
%% @result{} (sym) 3.14159265358979323846264338327950288419717
%%
%% >> digits(n_orig) # reset digits to saved value
%% @end group
%% @end example
%% @seealso{sym, vpa, vpasolve}
%% @end deftypefn
%% Author: Colin B. Macdonald
%% Keywords: symbolic
function m = digits(n)
if (nargin == 0) || (nargout == 1)
m = sympref('digits');
end
if (nargin == 1)
sympref('digits', n);
end
end
%!test
%! orig = digits(32); % to reset later
%! m = digits(64);
%! p = vpa(sym(pi));
%! assert (abs (double (sin(p))) < 1e-64)
%! n = digits(m);
%! assert (n == 64)
%! p = vpa(sym(pi));
%! assert (abs (double (sin(p))) < 1e-32)
%! assert (abs (double (sin(p))) > 1e-40)
%! digits(orig)
|