/usr/share/octave/packages/msh-1.0.10/msh3m_submesh.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{omesh},@var{nodelist},@var{elementlist}]} = @
## msh3m_submesh(@var{imesh},@var{intrfc},@var{sdl})
##
## Extract the subdomain(s) in @var{sdl} from @var{imesh}.
##
## The row vector @var{intrfc} contains the internal interface sides to
## be maintained (field @code{mesh.e(5,:)}). It can be empty.
##
## Return the vectors @var{nodelist} and @var{elementlist} containing
## respectively the list of nodes and elements of the original mesh that
## are part of the selected subdomain(s).
##
## @seealso{msh3m_join_structured_mesh, msh2m_join_structured_mesh,
## msh3m_submesh}
## @end deftypefn
function [omesh,nodelist,elementlist] = msh3m_submesh(imesh,intrfc,sdl)
## Check input
if nargin != 3
error("msh3m_submesh: wrong number of input parameters.");
elseif !(isstruct(imesh) && isfield(imesh,"p") &&
isfield (imesh,"t") && isfield(imesh,"e"))
error("msh3m_submesh: first input is not a valid mesh structure.");
elseif !isvector(sdl)
error("msh3m_submesh: third input is not a valid vector.");
endif
## Extract sub-mesh
## Build element list
elementlist=[];
for ir = 1:length(sdl)
elementlist = [ elementlist find(imesh.t(5,:)==sdl(ir)) ];
endfor
## Build nodelist
nodelist = reshape(imesh.t(1:4,elementlist),1,[]);
nodelist = unique(nodelist);
## Extract submesh
omesh.p = imesh.p (:,nodelist);
indx(nodelist) = 1:length (nodelist);
omesh.t = imesh.t (:,elementlist);
omesh.t(1:4,:) = indx(omesh.t(1:4,:));
omesh.e = [];
for ifac = 1:size(imesh.e,2)
if (length(intersect(imesh.e(1:3,ifac),nodelist) )== 3)
omesh.e = [omesh.e imesh.e(:,ifac)];
endif
endfor
omesh.e(1:3,:) = indx(omesh.e(1:3,:));
endfunction
%!shared mesh1,mesh2,jmesh,exmesh,nodelist,elemlist
% x = y = z = linspace(0,1,2);
% x2 = linspace(1,2,2);
% [mesh1] = msh3m_structured_mesh(x,y,z,1,1:6);
% [mesh2] = msh3m_structured_mesh(x2,y,z,1,1:6);
% [jmesh] = msh3m_join_structured_mesh(mesh1,mesh2,2,1);
% [exmesh,nodelist,elemlist] = msh3m_submesh(jmesh,2,1);
%!test
% assert(size(exmesh.p),size(mesh1.p))
%!test
% assert(size(exmesh.t),size(mesh1.t))
%!test
% assert(size(exmesh.e),size(mesh1.e))
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