Time Function from Laplace Transform

Return function handle that evaluates inverse Laplace transform.

INVLAPFUN Time Function from Laplace Transform.
FUN = INVLAPFUN(B,A) returns a function handle for evaluating the time function FUN(t) associated with the Laplace Transform B(s)/A(s), where B and A are the respective row vectors containing the polynomial coefficients.
FUN = INVLAPFUN(TF) uses the Control Toolbox transfer function object TF.
FUN = INVLAPFUN(ZPK) uses the Control Toolbox zero pole gain object ZPK.
FUN = INVLAPFUN(SS) uses the Control Toolbox state space object SS.

Inputs must be real valued and a single proper transfer function.

FUN(t) evaluates the inverse Laplace transform at the time points in the array t. FUN(t) = 0 for t<0
S = FUN('rpk') return a structure S with fields containing the residues,
poles, and direct terms as found by the function RESIDUE. That is,
S.r contains the residues,
S.p contains the poles, and
S.k contains the direct terms.