MATLAB: Produce an eggbox

eggbox

Dear all, I should produce an eggbox. I tried to use this code, following the instructions, but I did not receive what I needed. Where's the error?
        x=[-10:0.2469135802469136:+10]
        y=[-10:0.2469135802469136:+10]
        [X,Y]= meshgrid(x,y)
        M1=sin(X)
        M2=sin(Y)
        M12=M1*M2
        surf(X,Y)
        X.^2
Thanks a lot

Best Answer

The hint explicitly said element-by-element multiplication which is accomplished via
 M12 = M1.*M2  % note the use of  .*
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