COMSOL Multiphysics™

postinterp
Purpose
postinterp
Evaluate expressions in arbitrary points.
Syntax
Description
[v1,v2,...,vn,pe] = postinterp(fem,e1,e2,...,en,xx,...)
[pio,pe] = postinterp(fem,xx,...)
[v1,v2,...,vn] = postinterp(fem,e1,e2,...,en,pio,...)
[v1,v2,...,vn,pe] = postinterp(fem,e1,e2,...,en,xx,...) returns the
values v1,v2,...,vn of the expressions e1,e2,...,en in the points xx.
[pio,pe] = postinterp(fem,xx,...) computes a PostInterp object pio, which
contains information about where the points xx are located.
[v1,v2,...,vn] = postinterp(fem,e1,e2,...,en,pio,...) returns the
values v1,v2,...,vn of the expressions e1,e2,...,en in the points given by the
PostInterp object pio.
The columns of the matrix xx are the coordinates for the evaluation points. If the
number of rows in xx equals the space dimension, then xx are global coordinates,
and the property Edim determines the dimension in which the expressions are
evaluated. For instance, Edim=2 means that the expressions are evaluated on
boundaries in a 3D model. If Edim is less than the space dimension, then the points
in xx are projected onto the closest point on a domain of dimension Edim. If, in
addition, the property Dom is given, then the closest point on domain number Dom
in dimension Edim is used.
If the number of rows in xx is less than the space dimension, then these coordinates
are parameter values on a geometry face or edge. In that case, the domain number
for that face or edge must be specified with the property Dom.
The expressions that are evaluated can be expressions involving variables, in
particular application mode variables.
The matrices v1,v2,...,vn have size k-by-size(xx,2), where k is the number of
solutions for which the evaluation is carried out, see below. The value of expression
ei for solution number j in evaluation point xx(:,m) is vi(j,m).
The vector pe contains the indices m for the evaluation points xx(:,m) that are
outside the mesh, or, if a domain is specified, are outside that domain.
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