COMSOL Multiphysics™

elmapextr
Cautionary
Examples
Parameter or time dependency in the source transformation is not properly detected
by the solvers, which means that the source transformation will not be updated
between parameter or time steps in that case. Solution dependencies in the
transformation are properly detected, but do not give any Jacobian contributions
from the transformation.
Calculate the first ten eigenvalues of a 3-by-2 rectangle with periodic boundary
conditions both left-right and top-bottom. Different map types are used. Note that
this is the same example as used under elcplextr.
fem.geom = rect2(3,2);
fem.mesh = meshinit(fem,'hmax',0.05);
fem.equ.c = 1;
fem.equ.da = 1;
fem.bnd.ind = [0 1 2 0];
fem.bnd.constr = {'left2right(u)-u','lower2upper(u)-u'};
fem.elem = {};
el.elem = 'elmapextr';
el.g = {'1'};
el.opname = {'left2right','lower2upper'};
clear map1;
map1.type = 'unit';
clear map2;
map2.type = 'linear';
map2.sg = '1';
map2.sv = {'2','3'};
map2.dg = '1';
map2.dv = {'1','4'};
clear map3;
map3.type = 'local';
map3.expr = {'x'};
el.map = {map1 map2 map3};
el.srcmap = {'1','3'};
el.dstmap = {'2','3'};
clear src;
src.ind = {{'1'},{'4'}};
src.src = {{'2'},{'1'}};
el.geomdim{1} = {{},src,{}};
fem.elem = [fem.elem {el}];
fem.xmesh = meshextend(fem);
94 | CHAPTER 1: COMMAND REFERENCE