/usr/share/octave/packages/fpl-1.3.5/pdemesh.m is in octave-fpl 1.3.5-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## This file is part of:
## FPL - Fem PLotting package for octave
##
## FPL 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.
##
## FPL 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 FPL; If not, see <http://www.gnu.org/licenses/>.
##
## author: Carlo de Falco <cdf _AT_ users.sourceforge.net>
## -*- texinfo -*-
## @deftypefn {Function File} {@var{h} =} pdemesh (@var{p}, @var{e}, @var{t}, @var{u})
##
## Plot a triangular mesh in 3D given a mesh structure and node data.
## @var{p}, @var{t} are the mesh vertices and connectivity, @var{u} node data.
## @var{e} is ignored and is accepted only for compatibiity.
##
## @seealso{fpl_dx_write_field, fpl_vtk_write_field}
##
## @end deftypefn
function h = pdemesh (p, e, t, u)
## Check input
if (nargin < 3)
error("pdemesh: wrong number of input parameters");
elseif (nargin == 3)
u = zeros (1, columns (p));
endif
nel = columns (t);
npt = columns (p);
if (numel (u) != npt)
error("pdemesh: wrong data size");
endif
hs = ishold ();
### node data
H = trimesh (t(1:3, :).', p(1,:).', p(2,:).', u(:));
if (nargout == 1)
h = H;
endif
if (hs)
hold on;
else
hold off;
endif
endfunction
%!demo
%! msh = msh2m_structured_mesh ([0:.05:1], [0:.1:1], 1, 1:4, 'random');
%! x = msh.p(1,:)'; xm = sum(x(msh.t(1:3,:)),1)/3;
%! y = msh.p(2,:)'; ym = sum(y(msh.t(1:3,:)),1)/3;
%! pdemesh (msh.p, msh.t, msh.t, x.*(1-x).*y.*(1-y))
%! view(3)
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