Man Scilab

nlev Scilab Function

nlev - Leverrier's algorithm

Calling Sequence

[num,den]=nlev(A,z [,rmax])

Parameters

A : real square matrix
z : character string
rmax : optional parameter (see bdiag)

Description

[num,den]=nlev(A,z [,rmax]) computes (z*eye()-A)^(-1)

by block diagonalization of A followed by Leverrier's algorithm on each block.

This algorithm is better than the usual leverrier algorithm but still not perfect!

Examples


A=rand(3,3);x=poly(0,'x');
[NUM,den]=nlev(A,'x')
clean(den-poly(A,'x'))
clean(NUM/den-inv(x*eye()-A))

See Also

coff , coffg , glever , ss2tf ,

Author

F. Delebecque., S. Steer INRIA;