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nlev             Scilab Group             Scilab Function              nlev
NAME
   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
   computes:
  
 (z*eye()-A)^(-1) 
   by block diagonalization of A followed by Leverrier's algorithm on each
  block.
  
REMARK
   This algorithm is better than the usual leverrier algorithm but still not
  perfect!
  
EXAMPLE
 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. D., S. S.