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LISQ - A toolbox for the lifting scheme on 2D quincunx grids

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from LISQ - A toolbox for the lifting scheme on 2D quincunx grids by Paul De Zeeuw
A toolbox for the lifting scheme on 2D quincunx grids and for the computation of moment invariants

stencilxgridfRVC(G, Stencil, center) 
function F = stencilxgridfRVC(G, Stencil, center)
%------------------------------------------------------------------------------
% Multiplies gridfunction G with Stencil.
% Excess area is filled by Vertex-Centered (VC) Reflection across boundaries.
%
% Design and implementation by:
% Dr. Paul M. de Zeeuw <Paul.de.Zeeuw@cwi.nl>  http://homepages.cwi.nl/~pauldz/
% Last Revision: June 26, 2000.
% (c) 1999-2002 Stichting CWI, Amsterdam.
%------------------------------------------------------------------------------
o=[0 0];
if ~all(size(o) == size(center))
  error(' stencilxgridfRVC - unexpected dimensions of center ')
end
F=zeros(size(G));
[n, m] = size(Stencil);
for i=1:n
   for j=1:m
      sij = Stencil(i,j);
      if sij ~= 0   
        F = F + rayxgridfRVC(G, ([i j] - center), sij);
      end
   end
end   
%------------------------------------------------------------------------------

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