/usr/share/octave/packages/msh-1.0.10/msh2m_nodes_on_sides.m is in octave-msh 1.0.10-5.
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##
## This file is part of:
## MSH - Meshing Software Package for Octave
##
## MSH 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.
##
## MSH 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 MSH; If not, see <http://www.gnu.org/licenses/>.
##
## author: Carlo de Falco <cdf _AT_ users.sourceforge.net>
## author: Massimiliano Culpo <culpo _AT_ users.sourceforge.net>
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{nodelist}]} = @
## msh2m_nodes_on_sides(@var{mesh},@var{sidelist})
##
## Return a list of @var{mesh} nodes lying on the sides specified in
## @var{sidelist}.
##
## @seealso{msh2m_geometrical_properties, msh2m_topological_properties,
## msh3m_nodes_on_faces}
## @end deftypefn
function [nodelist] = msh2m_nodes_on_sides(mesh,sidelist)
## Check input
if nargin != 2 # Number of input parameters
error("msh2m_nodes_on_sides: wrong number of input parameters.");
elseif !(isstruct(mesh) && isfield(mesh,"p") &&
isfield(mesh,"t") && isfield(mesh,"e"))
error("msh2m_nodes_on_sides: first input is not a valid mesh structure.");
elseif !isnumeric(sidelist)
error("msh2m_nodes_on_sides: only numeric value admitted as sidelist.");
endif
## Search nodes
edgelist = [];
for ii = 1:length(sidelist)
edgelist=[edgelist,find(mesh.e(5,:)==sidelist(ii))];
endfor
nodelist = mesh.e(1:2,edgelist);
nodelist = [nodelist(1,:) nodelist(2,:)];
nodelist = unique(nodelist);
endfunction
%!test
%! [mesh1] = msh2m_structured_mesh(0:.5:1, 0:.5:1, 1, 1:4, 'left');
%! [mesh2] = msh2m_structured_mesh(1:.5:2, 0:.5:1, 1, 1:4, 'left');
%! [mesh] = msh2m_join_structured_mesh(mesh1,mesh2,2,4);
%! [nodelist] = msh2m_nodes_on_sides(mesh,[1 2]);
%! reallist = [1 4 7 8 9];
%! assert(nodelist,reallist);
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