//signals and systems
//bilateral Inverse Lapalce Transform 
//X(S) = 1/((s-1)(s+2))
s =%s ;
syms t ;
[A]=pfss(1/((s-1)*(s+2))) //partial fraction of F(s)
F1 = ilaplace(A(1),s,t)
F2 = ilaplace(A(2),s,t)
F=F1+F2;
disp(F,"f(t)=")


//X(S) = 1/((s-1)(s+2))  Re(s)> -1,Re(s)< -2
s =%s ;
syms t ;
[A]=pfss(1/((s-1)*(s+2))) //partial fraction of F(s)
F1 = ilaplace(A(1),s,t)
F2 = ilaplace(A(2),s,t)
F = -F1-F2;
disp(F,"f(t)=")


//X(S) = 1/((s-1)(s+2))  -2< Re(s)< 1
s =%s ;
syms t ;
[A]=pfss(1/((s-1)*(s+2))) //partial fraction of F(s)
F1 = ilaplace(A(1),s,t)
F2 = ilaplace(A(2),s,t)
F = -F1+F2;
disp(F,"f(t)=")