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    function dG= delknot(f,i)
%DELKNOT partial derivative for natural knots

%  Copyright 2000-2007 The MathWorks, Inc. and Ford Global Technologies, Inc.

c= getInputs(f);
p= double(f);

dG= zeros(1,length(p));
dG(i) = c.doDiffInv(p(i));