/usr/share/octave/packages/odepkg-0.8.4/odepkg_examples_dae.m is in octave-odepkg 0.8.4-1build1.
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 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 | %# Copyright (C) 2008-2012, Thomas Treichl <treichl@users.sourceforge.net>
%# OdePkg - A package for solving ordinary differential equations and more
%#
%# This program 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 2 of the License, or
%# (at your option) any later version.
%#
%# This program 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 program; If not, see <http://www.gnu.org/licenses/>.
%# -*- texinfo -*-
%# @deftypefn {Function File} {[@var{}] =} odepkg_examples_dae (@var{})
%# Open the DAE examples menu and allow the user to select a demo that will be evaluated.
%# @end deftypefn
function [] = odepkg_examples_dae ()
vode = 1; while (vode > 0)
clc;
fprintf (1, ...
['DAE examples menu:\n', ...
'==================\n', ...
'\n', ...
' (1) Solve the "Robertson problem" with solver "ode2r"\n', ...
' (2) Solve another "Robertson implementation" with solver "ode5r"\n', ...
'\n', ...
' Note: There are further DAE examples available with the OdePkg\n', ...
' testsuite functions.\n', ...
'\n', ...
' If you have another interesting DAE example that you would like\n', ...
' to share then please modify this file, create a patch and send\n', ...
' your patch with your added example to the OdePkg developer team.\n', ...
'\n' ]);
vode = input ('Please choose a number from above or press <Enter> to return: ');
clc; if (vode > 0 && vode < 3)
%# We can't use the function 'demo' directly here because it does
%# not allow to run other functions within a demo.
vexa = example (mfilename (), vode);
disp (vexa); eval (vexa);
input ('Press <Enter> to continue: ');
end %# if (vode > 0)
end %# while (vode > 0)
%!demo
%! # Solve the "Robertson problem" with a Mass function that is given by
%! # a function handle.
%!
%! function [vyd] = frobertson (vt, vy, varargin)
%! vyd(1,1) = -0.04 * vy(1) + 1e4 * vy(2) * vy(3);
%! vyd(2,1) = 0.04 * vy(1) - 1e4 * vy(2) * vy(3) - 3e7 * vy(2)^2;
%! vyd(3,1) = vy(1) + vy(2) + vy(3) - 1;
%! endfunction
%!
%! function [vmass] = fmass (vt, vy, varargin)
%! vmass = [1, 0, 0; 0, 1, 0; 0, 0, 0];
%! endfunction
%!
%! vopt = odeset ('Mass', @fmass, 'NormControl', 'on');
%! vsol = ode2r (@frobertson, [0, 1e5], [1, 0, 0], vopt);
%! plot (vsol.x, vsol.y);
%!demo
%! # Solve the "Robertson problem" with a Mass function that is given by
%! # a constant mass matrix.
%!
%! function [vyd] = frobertson (vt, vy, varargin)
%! vyd(1,1) = -0.04 * vy(1) + 1e4 * vy(2) * vy(3);
%! vyd(2,1) = 0.04 * vy(1) - 1e4 * vy(2) * vy(3) - 3e7 * vy(2)^2;
%! vyd(3,1) = vy(1) + vy(2) + vy(3) - 1;
%! endfunction
%!
%! vopt = odeset ('Mass', [1, 0, 0; 0, 1, 0; 0, 0, 0], ...
%! 'NormControl', 'on');
%! vsol = ode5r (@frobertson, [0, 1e5], [1, 0, 0], vopt);
%! plot (vsol.x, vsol.y);
%# Local Variables: ***
%# mode: octave ***
%# End: ***
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