Key to MATLAB Exercise 9 SchoolofMathematicalSciencesXiamenUniversityhttp://gdjpkc.xmu.edu.cn >>xu. cos(v); y=u. sin(v): Z=2 u+2V >>xlin=linspace(min(x), max(x), 33) > yin= linspace(min(y), max(y), 33) shgrid(xlin, lin) >>Z=griddata(x,y, z, X,Y,cubic) >>mesh(X,Y, z) > axis tight; hold on plot(x, y, z, ., MarkerSize, 15) Key to Ex9-6Key to MATLAB Exercise 9  School of Mathematical Sciences Xiamen University  http://gdjpkc.xmu.edu.cn  Key to Ex9­6  >> x=u.*cos(v); y=u.*sin(v); z=2*u+2*v;  >> xlin = linspace(min(x),max(x),33);  >> ylin = linspace(min(y),max(y),33);  >> [X,Y] = meshgrid(xlin,ylin);  >> Z = griddata(x,y,z,X,Y,'cubic');  >> mesh(X,Y,Z) >> axis tight; hold on  >> plot3(x,y,z,'.','MarkerSize',15)