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x_1=0:0.1:2;
x_2=0:0.1:2;
n=normrnd(0,0.1,21,21);
[x_1,x_2]=meshgrid(x_1,x_2);
yy=exp(-x_1).*(x_1.^2+x_2.^2)+n;
targ=yy;%Ä¿±êÊä³ö   [x_1,x_2,yy]ΪѵÁ·Êý¾ÝÑù±¾
xx=[x_1,x_2];
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