Laplace Transform in MATLAB

How to find inverse Laplace Transforms using MATLAB ?

Last Updated : 21 Apr, 2021

In this article, we will see how to find Laplace Transform in MATLAB. Laplace Transform helps to simplify problems that involve Differential Equations into algebraic equations. Inverse Laplace Transform converts Laplace Domain Function F(s) into time-domain function f(t)

$f(t) = L^{-1}[F(s)]$

Using the above function one can generate a Time-domain function of any Laplace expression.

Example 1: Find the Inverse Laplace Transform of $s/(a^2 + s^2)$

Matlab

% specify the variable a, t and s  
% as symbolic ones 
syms a t s 
  
% define function F(s)  
F = s/(a^2 + s^2); 
  
% ilaplace command to transform into time 
% domain function f(t)   
% Inverse Laplace Function 
f1=ilaplace(F,s,t); 
  
% Display the output value 
disp(f1); 
  
% Output can be verified by transforming  
% function f1 into Laplace Domain F(s) 
f=laplace(f1,t,s);  % Laplace Function 
disp(f);

Output:

which is $f(t) = cos(at)$

Example 2: Find the Inverse Laplace Transform of 1/(s-a)

Matlab

% specify the variable a, t and  
% s as symbolic ones 
syms a t s 
  
% define function F(s)  
F = 1/(s-a); 
  
% ilaplace command to transform into 
% time domain function f(t) 
% Inverse Laplace Function 
f1=ilaplace(F,s,t);  
  
% Display the output value 
disp(f1); 
  
% Output can be verified by transforming  
% function f1 into Laplace Domain F(s) 
f=laplace(f1,t,s);  % Laplace Function 
disp(f);

Output:

which is $f(t) = e^{at}$

Example 3: Find the Inverse Laplace Transform of $2/(s+1)+3/(s+2)+1/s$

Matlab

% specify the variable a, t and  
% s as symbolic ones 
syms a t s 
  
% define function F(s)  
F = 2/(s+1)+3/(s+2)+1/s; 
  
% ilaplace command to transform into 
% time domain function f(t)   
% Inverse Laplace Function 
f1=ilaplace(F,s,t); 
  
% Display the output value 
disp(f1); 
  
%Output can be verified by transforming  
% function f1 into Laplace Domain F(s) 
f=laplace(f1,t,s);  % Laplace Function 
disp(f);

Output:

which is $f(t) = 2e^{-t}+3e^{-2t}+1$

Laplace Transform in MATLAB

jatan_18

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