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    function [w,bnds]= exp(c,yhat,varargin);
% COVMODEL/EXP Exponential Covariance Model

%  Copyright 2000-2004 The MathWorks, Inc. and Ford Global Technologies, Inc.



if nargin==1
   w=0;
   bnds= [-Inf Inf];
else
   w= exp( (yhat).*c.wparam(1));
end