Key to MATLAB Exercise 9 SchoolofMathematicalSciencesXiamenUniversityhttp://gdjpkc.xmu.edu.cn Key to MATLAB Exercise 9-Graphics-Surface >>clear; clf, xlinspace(-4, 4, 20): y=linspace(-5, 5, 20); >>(X,Y]= meshgrid(x,y);Z=0.3°eXp(-0.15°(X^2+￥^2)-0.3*eXp(0.15°(X.^2+Y.A2) > plot(X,Y, 2); grid on > mesh(X,Y,Z) B如气:日 >>surf(X,Y,z) Key to Ex9-1Key to MATLAB Exercise 9  School of Mathematical Sciences Xiamen University  http://gdjpkc.xmu.edu.cn  Key to Ex9­1  Key to MATLAB Exercise 9 – Graphics ­Surface  1. >> clear; clf; x=linspace(­4,4,20); y=linspace(­5,5,20);  >> [X, Y]=meshgrid(x,y); Z=[0.3*exp(­0.15*(X.^2+Y.^2))­ 0.3*exp(0.15*(X.^2+Y.^2))];  1) >> plot3(X,Y,Z); grid on;  2) >> mesh(X,Y,Z) 3) >> surf(X,Y,Z)