R2009a matlab code for laplace and inverse laplace

What is the matlab code to find laplace transform and inverse laplace of certain equation. I am using Matlab version R2009a. the matlab code availab in help file is for Matlab version R2011a. Please help.

Answer 1

[Paulo Silva]

You need the Symbolic Math Toolbox™

Examples on how to use the laplace function:

syms t
f = t^4
laplace(f)

syms s
g = 1/sqrt(s)
laplace(g)

syms t a x
f = exp(-a*t)
laplace(f,x)

Examples on how to use ilaplace

syms s
f = 1/s^2
ilaplace(f)

syms a t
g = 1/(t-a)^2
ilaplace(g)

syms x u
syms a real
f = 1/(u^2-a^2)
simplify(ilaplace(f,x))