tf2des

transfer function to descriptor

Calling Sequence

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

Arguments

: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

Examples

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 polynomial matrix to descriptor form
• tf2ss transfer to state-space
• ss2des (polynomial) state-space to descriptor form
• des2tf descriptor to transfer function conversion