Key to MATLAB Exercise 9 SchoolofMathematicalSciencesXiamenUniversityhttp://gdjpkc.xmu.edu.cn > mesh(X,Y, z) it- yis Atrt Taal: Detha yidan. yA > surfc(, Y, z) B点口一 >>x=(9: 9;y=[-9: 9]:(X,Y=meshgrid(x, y) >> XY=(X. 2+Y.2).(1/2)+eps; Z=sin(XY) / XY > subplot(1, 3, 1): plot(x,Y,z) > title('Display by plots function ); xlabel('x): ylabel('y); zlabel(z); grid on > subplot( 1, 3, 2); mesh(X,Y, z); > title('Display by mesh function ); xlabel('x): ylabel('y); zlabel('z'); grid on > subplot(1, 3, 3); surf(X,Y, Z > title('Display by surf function); xlabel('x); ylabel(y); zlabel('z); grid onKey to MATLAB Exercise 9  School of Mathematical Sciences Xiamen University  http://gdjpkc.xmu.edu.cn  Key to Ex9­2  4) >> meshz(X,Y,Z) 5) >> surfc(X,Y,Z) 2.  >> clear; clf;  >> x=[­9:9];y=[­9:9]; [X,Y]=meshgrid(x,y);  >> XY= (X.^2+Y.^2).^(1/2)+eps; Z=sin(XY)./XY;  1) >> subplot(1,3,1); plot3(X, Y, Z);  >> title('Display by plots function'); xlabel('x'); ylabel('y'); zlabel('z'); grid on  2) >> subplot(1,3,2); mesh(X,Y,Z);  >> title('Display by mesh function'); xlabel('x'); ylabel('y'); zlabel('z'); grid on  3) >> subplot(1,3,3); surf(X, Y, Z);  >> title('Display by surf function'); xlabel('x'); ylabel('y'); zlabel('z'); grid on