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    <span class="path" dir="ltr"><a href="index.html">FOSSEE_Communication_Systems_Toolbox</a> &gt;&gt; <a href="section_1f049b1e3111e3d1d538e7603f77f589.html">FOSSEE_Communication_Systems_Toolbox</a> &gt; iscatastrophic</span>

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    <div class="refnamediv"><h1 class="refname">iscatastrophic</h1>
    <p class="refpurpose">This function  determines if a convolutional code is catastrophic or not</p></div>


<div class="refsection"><h3 class="title">Description</h3>
   <p class="para">RESULT = ISCATASTROPHIC(TRELLIS) returns 1 if the specified
trellis corresponds to a catastrophic convolutional code, else 0.</p></div>

<div class="refsection"><h3 class="title">Examples</h3>
   <div class="programlisting"><table border="0" width="100%"><tr><td width="98%"><pre class="scilabcode"><span class="scilabid">eg_1</span><span class="scilaboperator">.</span><span class="scilabfield">numInputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">4</span><span class="scilabdefault">;</span>
<span class="scilabid">eg_1</span><span class="scilaboperator">.</span><span class="scilabfield">numOutputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">4</span><span class="scilabdefault">;</span>
<span class="scilabid">eg_1</span><span class="scilaboperator">.</span><span class="scilabfield">numStates</span> <span class="scilaboperator">=</span> <span class="scilabnumber">3</span><span class="scilabdefault">;</span>
<span class="scilabid">eg_1</span><span class="scilaboperator">.</span><span class="scilabfield">nextStates</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span><span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">eg_1</span><span class="scilaboperator">.</span><span class="scilabfield">outputs</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span><span class="scilabnumber">1</span> <span class="scilabnumber">1</span> <span class="scilabnumber">2</span> <span class="scilabnumber">1</span><span class="scilabdefault">;</span> <span class="scilabnumber">1</span> <span class="scilabnumber">0</span> <span class="scilabnumber">1</span> <span class="scilabnumber">1</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">res_t_eg_1</span><span class="scilaboperator">=</span><span class="scilabid">istrellis</span><span class="scilabopenclose">(</span><span class="scilabid">eg_1</span><span class="scilabopenclose">)</span>
<span class="scilabid">res_c_eg_1</span><span class="scilaboperator">=</span><span class="scilabid">iscatastrophic</span><span class="scilabopenclose">(</span><span class="scilabid">eg_1</span><span class="scilabopenclose">)</span>
<span class="scilabskeyword">if</span> <span class="scilabopenclose">(</span><span class="scilabid">res_c_eg_1</span><span class="scilabopenclose">)</span> <span class="scilabskeyword">then</span>
<a class="scilabcommand" href="scilab://disp">disp</a><span class="scilabopenclose">(</span><span class="scilabstring">&#0039;</span><span class="scilabstring">Example 1 is catastrophic</span><span class="scilabstring">&#0039;</span><span class="scilabopenclose">)</span>
<span class="scilabskeyword">else</span>
<a class="scilabcommand" href="scilab://disp">disp</a><span class="scilabopenclose">(</span><span class="scilabstring">&#0039;</span><span class="scilabstring">Example 1 is not catastrophic</span><span class="scilabstring">&#0039;</span><span class="scilabopenclose">)</span>
<span class="scilabskeyword">end</span>
<span class="scilabid">eg_2</span><span class="scilaboperator">.</span><span class="scilabfield">numInputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">2</span><span class="scilabdefault">;</span>
<span class="scilabid">eg_2</span><span class="scilaboperator">.</span><span class="scilabfield">numOutputSymbols</span> <span class="scilaboperator">=</span> <span class="scilabnumber">4</span><span class="scilabdefault">;</span>
<span class="scilabid">eg_2</span><span class="scilaboperator">.</span><span class="scilabfield">numStates</span> <span class="scilaboperator">=</span> <span class="scilabnumber">2</span><span class="scilabdefault">;</span>
<span class="scilabid">eg_2</span><span class="scilaboperator">.</span><span class="scilabfield">nextStates</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">0</span><span class="scilabdefault">;</span> <span class="scilabnumber">1</span> <span class="scilabnumber">1</span> <span class="scilabopenclose">]</span>
<span class="scilabid">eg_2</span><span class="scilaboperator">.</span><span class="scilabfield">outputs</span> <span class="scilaboperator">=</span> <span class="scilabopenclose">[</span><span class="scilabnumber">0</span> <span class="scilabnumber">0</span><span class="scilabdefault">;</span> <span class="scilabnumber">1</span> <span class="scilabnumber">1</span><span class="scilabopenclose">]</span><span class="scilabdefault">;</span>
<span class="scilabid">res_t_eg_2</span><span class="scilaboperator">=</span><span class="scilabid">istrellis</span><span class="scilabopenclose">(</span><span class="scilabid">eg_2</span><span class="scilabopenclose">)</span>
<span class="scilabid">res_c_eg_2</span><span class="scilaboperator">=</span><span class="scilabid">iscatastrophic</span><span class="scilabopenclose">(</span><span class="scilabid">eg_2</span><span class="scilabopenclose">)</span>
<span class="scilabskeyword">if</span> <span class="scilabopenclose">(</span><span class="scilabid">res_c_eg_2</span><span class="scilabopenclose">)</span> <span class="scilabskeyword">then</span>
<a class="scilabcommand" href="scilab://disp">disp</a><span class="scilabopenclose">(</span><span class="scilabstring">&#0039;</span><span class="scilabstring">Example 2 is catastrophic</span><span class="scilabstring">&#0039;</span><span class="scilabopenclose">)</span>
<span class="scilabskeyword">else</span>
<a class="scilabcommand" href="scilab://disp">disp</a><span class="scilabopenclose">(</span><span class="scilabstring">&#0039;</span><span class="scilabstring">Example 2 is not catastrophic</span><span class="scilabstring">&#0039;</span><span class="scilabopenclose">)</span>
<span class="scilabskeyword">end</span></pre></td><td valign="top"><a href="scilab://scilab.execexample/"><img src="ScilabExecute.png" border="0"/></a></td><td valign="top"><a href="scilab://scilab.editexample/"><img src="ScilabEdit.png" border="0"/></a></td><td></td></tr></table></div></div>

<div class="refsection"><h3 class="title">Authors</h3>
   <ul class="itemizedlist"><li class="member">Pola Lakshmi Priyanka, IIT Bombay</li></ul></div>
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