matlab编程问题z(find(z>0))=nan作何解释a1=-0.05;%微凸体1的参数y=a*x^2+b*y^2+cb1=-0.2;c1=5;x=linspace(-sqrt(abs(c1/a1)),sqrt(abs(c1/a1)),100);y=linspace(-sqrt(abs(c1/b1)),sqrt(abs(c1/b1)),100);[x,y]=meshgrid(linspace(-sqrt(abs(c1/a1)),sqr
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