How to bode plot exp(-0.1s) - 1?

2017 3 25
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更新时间：2017 3 25
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I wanted to reproduce this example on my own, but I couldn't figure out how to bode plot exp(-0.1s) - 1. I tried:
f = tf([exp(-0.1) -1], [1]);
bode(f)
Which gave me a different bode plot from the book.
Any idea?

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Star Strider
Star Strider 2017-3-25

2 个投票

You have to set the transfer function variable to ‘continuous’ with the initial tf call, then you can use symbolic variables in the transfer function.
The Code —
s = tf('s');
f = exp(-0.1*s);
[mag,phase,wout] = bode(f-1, {1E-1 1E+3});
figure(1)
subplot(2,1,1)
loglog(squeeze(wout), squeeze(mag))
set(gca, 'YLim',[1E-3 1E1])
grid
subplot(2,1,2)
semilogx(squeeze(wout), squeeze(phase))
This plot will reproduce the solid line in FIGURE 4.1.

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