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.TH rational 1 "April 1993" "Scilab Group" "Scilab Objects"
.so ../sci.an
.SH NAME
rational - Scilab objects, rational in Scilab
.SH DESCRIPTION
A rational \fVr\fR is a quotient of two polynomials \fVr=num/den\fR.
The internal representation of a rational is a list.
\fVr=tlist('['r','num','den','dt'],num,den,[])\fR is the same as \fVr=num/den\fR.
A rational matrix can be defined with the usual syntax
e.g. \fV[r11,r12;r21,r22]\fR is a 2x2 matrix where \fVrij\fR are
1x1 rationals.
A rational matrix can also be defined as above as a list
\fVtlist(['r','num','den','dt'],num,den,[])\fR with \fVnum\fR and \fVden\fR polynomial matrices.
.SH EXAMPLES
.nf
s=poly(0,'s');
W=[1/s,1/(s+1)]
W'*W
Num=[s,s+2;1,s];Den=[s*s,s;s,s*s];
tlist(['r','num','den','dt'],Num,Den,[])
H=Num./Den
syslin('c',Num,Den)
syslin('c',H)
[Num1,Den1]=simp(Num,Den)
.fi
.SH SEE ALSO
poly, syslin, simp
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