File: tf2des.cat

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tf2des            Scilab Group            Scilab Function            tf2des
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.
  Otherwise 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