/usr/share/octave/packages/secs2d-0.0.8/Utilities/Ustructmesh_random.m is in octave-secs2d 0.0.8-5.
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 | function [p,e,t]=Ustructmesh_random(x,y,region,sides)
% [p,e,t]=Ustructmesh(x,y,region,sides)
% This file is part of
%
% SECS2D - A 2-D Drift--Diffusion Semiconductor Device Simulator
% -------------------------------------------------------------------
% Copyright (C) 2004-2006 Carlo de Falco
%
%
%
% SECS2D 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.
%
% SECS2D 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 SECS2D; If not, see <http://www.gnu.org/licenses/>.
x = sort(x);
y = sort(y);
nx = length(x);
ny = length(y);
[XX,YY] = meshgrid(x,y);
p = [XX(:),YY(:)]';
iiv (ny,nx)=0;
iiv(:)=1:nx*ny;
iiv(end,:)=[];
iiv(:,end)=[];
iiv=iiv(:)';
niiv = length(iiv);
theperm = iiv(randperm(niiv));
first = theperm(1:floor(niiv/2));
second = theperm(floor(niiv/2)+1:end);
t = [[first;first+ny;first+ny+1],[first;first+ny+1;first+1] ];
t = [t,[second;second+ny;second+1],[second+ny;second+ny+1;second+1] ];
t (4,:)=region;
l1 = 1+ny*([1:nx]-1);
l4 = 1:ny;
l2 = ny*(nx-1)+1:nx*ny;
l3 = ny + l1 -1;
e = [ l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])
l1([2:end]) l2([2:end]) l3([2:end]) l4([2:end])
[l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0
[l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0
l1([1:end-1])*0+sides(1) l2([1:end-1])*0+sides(2) l3([1:end-1])*0+sides(3) l4([1:end-1])*0+sides(4)
[l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0
[l1([1:end-1]) l2([1:end-1]) l3([1:end-1]) l4([1:end-1])]*0+region
];
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