ex1_2.m

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[x,y] = meshgrid(-3:1/8:3);
z =  3*(1-x).^2.*exp(-(x.^2) - (y+1).^2)- 10*(x/5 - x.^3 - y.^5)...
  .*exp(-x.^2-y.^2)- 1/3*exp(-(x+1).^2 - y.^2);
surf(x,y,z), shading interp; colorbar