File: ss2tf.cat

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ss2tf(1)                       Scilab Function                       ss2tf(1)
NAME
  ss2tf - conversion from state-space to transfer function

CALLING SEQUENCE
  [h]=ss2tf(sl)
  [Ds,NUM,chi]=ss2tf(sl)

PARAMETERS

  sl        : linear system (syslin list)

  h         : transfer matrix

DESCRIPTION
  Called with three outputs [Ds,NUM,chi]=ss2tf(sl) returns the numerator
  polynomial matrix NUM, the characteristic polynomial chi and the polynomial
  part Ds separately i.e.:
  h=NUM/chi + Ds

  Method:

  One uses the characteristic polynomial and det(A+Eij)=det(A)+C(i,j) where C
  is the adjugate matrix of A.

EXAMPLE
  s=poly(0,'s');
  h=[1,1/s;1/(s^2+1),s/(s^2-2)]
  sl=tf2ss(h);
  h=clean(ss2tf(sl))
  [Ds,NUM,chi]=ss2tf(sl)

SEE ALSO
  tf2ss, syslin, nlev, glever