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function her = hermite(m,x)
% This fuction is used to produce hermite polynomials with order of m.
if m==0
    her = ones(size(x));
elseif m==1
    her = 2*x;
else
    her = 2*x.*hermite(m-1,x)-(m-1)*2*hermite(m-2,x);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%exmp1_6_2Ä£Äâ¸ß½×¶òÃ×-¸ß˹¹âÊø
clear
clc
x = linspace(-3,3,500);
y = x;
[xx,yy] = meshgrid(x,y);
k = 1;
for m= 0:2
    for n = 0:2
        Ie = hermite(m,sqrt(2)*xx).^2.*hermite(n,sqrt(2)*yy).^2.*exp(-2*(xx.^2 + yy.^2));
        subplot(3,3,k);
        surf(xx,yy,Ie);
        shading interp;
        axis equal;
        axis([-3,3,-3,3]);
        box on;
        axis off;
        hold on;
        k = k+1;
    end
end
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