computation of conformal maps to polygonally bounded regions

				function Mi = scmapinv(M)
				%SCMAPINV Inverse of a Schwarz-Christoffel map.
				%   SCMAPINV(M) returns a dummy object that represents the inverse of
				%   the SC map M. The only things possible with this object are to EVAL
				%   it or INV it back to the SC map.
				%   
				%   See also SCMAPINV/EVAL, SCMAPINV/SUBSREF, SCMAPINV/INV.
				
				%   Copyright 1998 by Toby Driscoll.
				%   $Id: scmapinv.m 155 2001-07-20 13:53:44Z driscoll $
				
				if nargin==0
				  Mi.themap = [];
				else
				  Mi.themap = M;
				end
				
				Mi = class(Mi,'scmapinv');