COMSOL Multiphysics™

posteval
Solnum is provided, the solution indicated by the indices provided with the Solnum
property are used. It T is provided, solutions are interpolated The property T can
only be used for time dependent solutions. If nether Solnum nor T is provided, a
single solution is evaluated. For parametric and time-dependent solutions, the final
solution is used. For eigenvalue solution the first solution is used.
For time-dependent problems, the variable t can be used in the expressions ei. The
value of t is the interpolation time when the property T is provided, and the time
for the solution, when Solnum is used. Similarly, lambda and the parameter are
available as eigenvalues for eigenvalue problems and as parameter value for
parametric problems, respectively.
When the property Phase is used, the solution vector is multiplied with
exp(i*phase) before evaluating the expression.
Example
Solve Poisson’s equation on two rectangles and evaluate the solution on one of
them and the negative solution on the other.
clear fem
fem.geom = square2(1,'pos',[0 -1])+square2;
fem.mesh = meshinit(fem);
fem.equ.c = 1; fem.equ.f = 1;
fem.bnd.h = 1;
fem.equ.expr = {'uu' {'u','-u'}};
fem.xmesh = meshextend(fem);
fem.sol = femstatic(fem);
pd = posteval(fem,'uu');
Compatibility
The properties Spoint and Bpoint was re-introduced and Prpoint was introduced
in COMSOL Multiphysics 3.2a.
The FEMLAB 3.0 output type has been changed to a structure containing data
suitable for further postprocessing. The new output format is incompatible with
FEMLAB 2.3 and earlier versions.
The properties Context, Contorder, Posttype, and Spoint are obsolete from
FEMLAB 3.0.
The property Variables has been renamed to Const in FEMLAB 2.3.
The properties Bdl, Epoint, Sdl, and Tpoint, are obsolete from FEMLAB 2.2.
Use the Dl property to specify domain lists. The post data format has changed in
FEMLAB 2.2 and later versions.
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