Plotting a time series e^(-at) cos⁡((bt) u_s (t)) for two cases, first for a=3 and b=50, then for a=-3 and b=50.

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Christi Kruger
Christi Kruger 2023-9-29
评论： Dyuman Joshi 2023-9-30
I have been trying to plot the time series (e^(-at)*cos(bt)*u_s(t))) for two cases, first for a=3 and b=50, then for a=-3 and b=50 . Plot both cases on the same plot. Let the vertical axis span from -6 to 6 and the horizontal axis from 0 to 1 seconds.
Please help me rewrite this code:
a1=3;
b1=50;
a2 = -3;
b2= 50;
f1 = exp^(-a1*t)*cos(b1*t)*u(t);
f2 = exp^(-a2*t)*cos(b2*t)*u(t);
ts1 = timeseries (f1,0:1);
ts2 = timeseries(f2,0:1);
ts1.Name = 'time series';
ylim(-6:6);
plot(ts1);
hold on
plot(ts2);
  2 个评论
Dyuman Joshi
Dyuman Joshi 2023-9-30
An error occurs in this line -
ylim(-6:6);
This is not how ylim works.
From the documentation - "Specify limits as a two-element vector of the form [ymin ymax], where ymax is greater than ymin."
And you don't need to define the variables as timeseries object. Plot directly, as has been show below.
You can also use fplot

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回答（1 个）

KSSV
KSSV 2023-9-30
Ran in:
clc; clear ;
a1=3;
b1=50;
a2 = -3;
b2= 50;
t = linspace(0,1) ;
f1 = exp(-a1*t).*cos(b1*t) ;
f2 = exp(-a2*t).*cos(b2*t);
plot(t,f1,'r');
hold on
plot(t,f2,'b');
ylim([-6 6])
legend('f1','f2')

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