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.
