Find the variation of x(t)

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Abhinav Raghunandan
Abhinav Raghunandan on 17 May 2022
Given differential equation
x''(t) + 7x'(t) + 5x(t) = 8u(t) where u is the unit step signal.
Initial Conditions: x(0) = 1, x'(0) = 2
Can someone please help me out to plot x(t) using Matlab with the given initial conditions?

Accepted Answer

Chunru
Chunru on 17 May 2022
Edited: Chunru on 17 May 2022
syms x(t)
Dx = diff(x, t);
eqn = diff(Dx, t) + 7* Dx + 5*x == 8
eqn(t) = 
cond = [x(0)==1, Dx(0)==2];
y = dsolve(eqn, cond)
y = 
fplot(y, [0 5])
  3 Comments
Chunru
Chunru on 17 May 2022
since u(t)=1 for t>0 and the initial condition is at t=0, it take cares of u(t).
[0, 5] indicates the plotting interval for t is from 0 to 5 as shown in the plot.
Abhinav Raghunandan
Abhinav Raghunandan on 17 May 2022
thank you so much!

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