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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from istrellis.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="istrellis" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:scilab="http://www.scilab.org"
xmlns:db="http://docbook.org/ns/docbook">
<refnamediv>
<refname>istrellis</refname>
<refpurpose>This function checks if the given input is of trellis structure</refpurpose>
</refnamediv>
<refsection>
<title>Description</title>
<para>
[ISOK, STATUS] = ISTRELLIS(S) returns [T,''] if the given input is valid trellis structure. Otherwise ISOK is F and STATUS
indicates the reason for invalidity
</para>
<para>
Fields in trellis structure are
numInputSymbols, (number of input symbols)
numOutputSymbols, (number of output symbols)
numStates, (number of states)
nextStates, (next state matrix)
outputs, (output matrix)
</para>
<para>
Properties of the fields are as follows
numInputSymbols and numOutputSymbols should be a power of 2 (as data is represented in bits).
The 'nextStates' and 'outputs' fields are matrices of size 'numStates' x 'numInputSymbols' .
Each element in the 'nextStates' matrix and 'output' matrix is an integer value between zero and (numStates-1).
The (r,c) element of the 'nextStates' matrix and 'output' matrix,denotes the next state and output respectively when
the starting state is (r-1) and the input bits have decimal representation (c-1).
</para>
<para>
To convert to decimal value, use the first input bit as the most significant bit (MSB).
</para>
<para>
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
Valid trellis structure
trellis.numInputSymbols = 4;
trellis.numOutputSymbols = 4;
trellis.numStates = 3;
trellis.nextStates = [0 1 2 1;0 1 2 1; 0 1 2 1];
trellis.outputs = [0 0 1 1;1 1 2 1; 1 0 1 1];
[isok,status] = istrellis(trellis)
Inavlid trellis structure
trellis.numInputSymbols = 3;
trellis.numOutputSymbols = 3;
trellis.numStates = 3;
trellis.nextStates = [0 1 2 ;0 1 2 ; 0 1 2 ];
trellis.outputs = [0 0 1 ;1 1 2 ; 1 0 1 ];
[isok,status] = istrellis(trellis)
]]></programlisting>
</refsection>
<refsection>
<title>Authors</title>
<simplelist type="vert">
<member>Pola Lakshmi Priyanka, IIT Bombay</member>
</simplelist>
</refsection>
</refentry>
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