x=-10:0.1:10;y=x;
>> [X,Y]=meshgrid(x,y);
>> Z=2*X.^2-2*X.*Y+Y.^2-3*X+Y;
>> mesh(X,Y,Z)
[x,y]=meshgrid(-5:0.01:5);z=2*x.^2-2*x*y+y.^2-3*x+y;mesh(x,y,z)
ezmesh('2*X.^2-2*X.*Y+Y.^2-3*X+Y')
