function vsig = sigheti(xdata,sigma) 
% SIGSHETD, Creates col vector of SIGmas, for use in data 
%      generation
%     The noise increases from left to right
%     For use in NonParametric Regression MOVies

%    Copyright (c) J. S. Marron and D. Ruppert, 1997

param = 1.2 ;

pattern = exp(param * xdata) ;
vsig = sigma * pattern/mean(pattern) ;

