Page 67 - MATLAB an introduction with applications
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52 ——— MATLAB: An Introduction with Applications
(e) t = linspace(0,2*pi,200);
f = exp(–0.6*t)*sin(t);
stem(t, f)
0.6
0.5
0.4
0.3
0.2
0.1
0
–0.1
0 1 2 3 4 5 6 7
Fig. E1.10(e)
(f ) r =–7:0.2:7;
[X,Y]= meshgrid(r,r);
Z = –0.333*X.^2+2*X*Y+Y.^2;
cs=contour(X,Y,Z);
label(cs)
+
+ 100
6
+ 50
4
2
0 + 0
+ 0
–2
–4 50
+
50
–6 + 100
–6 –4 –2 0 2 4 6
Fig. E1.10(f)
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