>> z1=x.^2-y.^2;
>> z1=x.^2-y.^2;
>> z2=sqrt(z1.*(z1>0));
>> z3=-z2;
>> mesh(x,y,z2)
>> hold on
>> mesh(x,y,z3)
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[x,y]=meshgrid(-10:0.1:10);
>> z1=x.^2-y.^2;
>> z1=x.^2-y.^2;
>> z2=sqrt(z1.*(z1>0));
>> z3=-z2;
>> mesh(x,y,z2)
>> hold on
>> mesh(x,y,z3)
>> z1=x.^2-y.^2;
>> z1=x.^2-y.^2;
>> z2=sqrt(z1.*(z1>0));
>> z3=-z2;
>> mesh(x,y,z2)
>> hold on
>> mesh(x,y,z3)