File: pol2des.cat

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pol2des(1)                     Scilab Function                     pol2des(1)
NAME
  pol2des - polynomial matrix to descriptor form

CALLING SEQUENCE
  [N,B,C]=pol2des(Ds)

PARAMETERS

  Ds          : polynomial matrix

  N, B, C     : three real matrices

DESCRIPTION
  Given the polynomial matrix Ds=D_0 +D_1 s +D_2 s^2 +... +D_k s^k, pol2des
  returns three  matrices N, B, C, with N nilpotent such that:

  Ds = C (sN-eye)^-1 B

EXAMPLE
  s=poly(0,'s');
  G=[1,s;1+s^2,3*s^3];[N,B,C]=pol2des(G);
  G1=clean(C*inv(s*N-eye)*B),G2=numer(G1)

SEE ALSO
  ss2des, tf2des

AUTHOR
  F.D.