File: tf2des.cat

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tf2des(1)                      Scilab Function                      tf2des(1)
NAME
  tf2des - transfer function to descriptor

CALLING SEQUENCE
  S=tf2des(G)
  S=tf2des(G,flag)

PARAMETERS

  G    : linear system (syslin list) with possibly polynomial D matrix

  flag : character string "withD"

  S    : list

DESCRIPTION
  Transfer function to descriptor form: S=list('d',A,B,C,D,E)
    E*xdot = A*x+B*u
    y = C*x + D*u
  Note that D=0 if the optional parameter flag="withD" is not given. Other-
  wise a maximal rank D matrix is returned in the fifth entry of the list S

EXAMPLE
  s=poly(0,'s');
  G=[1/(s-1),s;1,2/s^3];
  S1=tf2des(G);des2tf(S1)
  S2=tf2des(G,"withD");des2tf(S2)

SEE ALSO
  pol2des, tf2ss, ss2des, des2tf