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.TH ss2des 1 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
ss2des - (polynomial) state-space to descriptor form
.SH CALLING SEQUENCE
.nf
S=ss2des(Sl)
S=ss2des(Sl,flag)
.fi
.SH PARAMETERS
.TP 10
Sl
: \fVsyslin\fR list: proper or improper linear system.
.TP
flag
: character string \fV"withD"\fR
.TP
S
: list
.SH DESCRIPTION
Given the linear system in state-space representation
\fVSl\fR (\fVsyslin\fR list), with a \fVD\fR matrix which is either
polynomial or constant, but not zero \fVss2des\fR
returns a descriptor system as \fVlist('des',A,B,C,0,E)\fR
such that:
.nf
Sl=C*(s*E-A)^(-1)*B
.fi
If the flag \fV"withD"\fR is given, \fV S=list('des',A,B,C,D,E) \fR
with a \fVD\fR matrix of maximal rank.
.SH EXAMPLE
.nf
s=poly(0,'s');
G=[1/(s+1),s;1+s^2,3*s^3];Sl=tf2ss(G);
S=ss2des(Sl)
S1=ss2des(Sl,"withD")
Des=des2ss(S);Des(5)=clean(Des(5))
Des1=des2ss(S1)
.fi
.SH SEE ALSO
pol2des, tf2des, des2ss
.SH AUTHOR
F. D.
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