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.TH tf2des 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
tf2des - transfer function to descriptor
.SH CALLING SEQUENCE
.nf
S=tf2des(G)
S=tf2des(G,flag)
.fi
.SH PARAMETERS
.TP
G
: linear system (\fVsyslin\fR list) with possibly polynomial \fVD\fR matrix
.TP
flag
: character string \fV"withD"\fR
.TP
S
: list
.SH DESCRIPTION
Transfer function to descriptor form: \fVS=list('d',A,B,C,D,E)\fR
.nf
E*xdot = A*x+B*u
y = C*x + D*u
.fi
Note that \fVD=0\fR if the optional parameter flag=\fV"withD"\fR is not
given. Otherwise a maximal rank \fVD\fR matrix is returned in the fifth
entry of the list \fVS\fR
.SH EXAMPLE
.nf
s=poly(0,'s');
G=[1/(s-1),s;1,2/s^3];
S1=tf2des(G);des2tf(S1)
S2=tf2des(G,"withD");des2tf(S2)
.fi
.SH SEE ALSO
pol2des, tf2ss, ss2des, des2tf
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