LaPlace transform, magnitude, poles.

I need some hep with this last step.

I am following a guide to try and info out of a laplace transform.

This is the code I have, and my attempt to get the highlighted solution.

This has everything I need I am just not sure how to get the final output. For example I don't know how MATLAB will always order the values. Like if -0.25 should be assigned to s or s^2.

Answer 1

[Star Strider]

I don’t recognise ‘poly2str’ and the only MATLAB function I can find that would be similar is poly2sym.

Taking a shortcut, try this —

syms F(s) s t 
F(s) = (s^2+1) / (s^2*(s+2))

F(s) = 

F = partfrac(F)

F(s) = 

f(t) = ilaplace(F)

f(t) = 

f = vpa(f, 3)

f(t) = 

The partfrac function was introduced in R2015a.

.

[Kyle Langford]

I like this a lot more than what I was doing. Thank you so much!

[Star Strider]

My pleasure!