MATLAB: How to bode plot exp(-0.1s) – 1

bodebode plotbodeplot

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?

Best Answer

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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