Page 68 - MATLAB an introduction with applications
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MATLAB Basics ——— 53
Example E1.11: Use the functions listed in Table 1.30 for plotting 3-D data for the following:
2
x + y 2
(a) z = cos x cos y e − 5
|x| ≤ = 7, |y| ≤ 7
(b) Discrete data plots with stems
x = t, y = t cos(t)
z = e – 2; 0 ≤ t ≤ 5π
t/5
(c) A cylinder generated by
r = sin(5πz) + 3
0 ≤ z ≤ 1; 0 ≤ θ ≤ 2π
Solution:
(a) u=–7:0.2:7;x
[X,Y]=meshgrid(u,u);
Z=cos(X)*cos(Y)*exp(–sqrt(X^2+Y^2)/5);
surf(X,Y,Z)
1
0.5
0
–0.5
–1
10
5 10
5
0
0
–5 –5
–10 –10
Fig. E1.11(a)
(b) t=linspace(0,5*pi,200);
x=t; y=t*cos(t);
z=exp(t/5) –2;
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