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  <title>Description of backtr</title>
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<!-- ../../menu.html chronux_2_10 --><!-- # locfit --><!-- menu.html m -->
<h1>backtr
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong></strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>function z=backtr(y,fit) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre class="comment">
 Inverse-link transformation of y.</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../../../matlabicon.gif)">
</ul>
This function is called by:
<ul style="list-style-image:url(../../../matlabicon.gif)">
<li><a href="fitted.html" class="code" title="function y = fitted(fit)">fitted</a>	Fitted values from a locfit object.</li></ul>
<!-- crossreference -->


<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function z=backtr(y,fit)</a>
0002 <span class="comment">%</span>
0003 <span class="comment">% Inverse-link transformation of y.</span>
0004 
0005 fali = fit.fit_points.family_link;
0006 link = fali(2);
0007 <span class="keyword">switch</span> link
0008   <span class="keyword">case</span> 3
0009     z=y;
0010   <span class="keyword">case</span> 4
0011     z=exp(y);
0012   <span class="keyword">case</span> 5
0013     z = y;
0014     i = find(y&lt;=0);
0015     <span class="keyword">if</span> (length(i)&gt;0)
0016       z(i) = exp(y(i))./(1+exp(y(i)));
0017     <span class="keyword">end</span>;
0018     i = find(y&gt;0);
0019     <span class="keyword">if</span> (length(i)&gt;0)
0020       z(i) = 1./(1+exp(-y(i)));
0021     <span class="keyword">end</span>;
0022   <span class="keyword">case</span> 6
0023     z=1./y;
0024   <span class="keyword">case</span> 7
0025     z=y.*abs(y);
0026   <span class="keyword">case</span> 8
0027     z=sin(y).^2;
0028   <span class="keyword">otherwise</span>
0029      disp(<span class="string">'Backtr: invalid link'</span>);
0030      z=y;
0031 <span class="keyword">end</span>;
0032 
0033 <span class="keyword">return</span>;</pre></div>
<hr><address>Generated on Fri 12-Aug-2011 11:36:15 by <strong><a href="http://www.artefact.tk/software/matlab/m2html/" target="_parent">m2html</a></strong> &copy; 2005</address>
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