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    clear;
x=0:0.1:2*pi;
[x,y]=meshgrid(x);
z=sin(y).*cos(x);
plot3(x,y,z);        %绘制图4-27
xlabel('x-axis');ylabel('y-axis');zlabel('z-axis');
title('plot3-1');grid on;

clear;
x=0:0.1:2*pi;
[x,y]=meshgrid(x);
z=sin(y).*cos(x);
mesh(x,y,z);        %绘制图4-28
xlabel('x-axis');ylabel('y-axis');zlabel('z-axis');
title('mesh');grid on;

%代码3：
clear;
x=0:0.1:2*pi;
[x,y]=meshgrid(x);
z=sin(y).*cos(x);
surf(x,y,z);         %绘制图4-29
xlabel('x-axis');ylabel('y-axis');zlabel('z-axis');
title('surf');grid on;