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- <title>Description of backtr</title>
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- <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>
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- <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>
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- <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<=0);
- 0015 <span class="keyword">if</span> (length(i)>0)
- 0016 z(i) = exp(y(i))./(1+exp(y(i)));
- 0017 <span class="keyword">end</span>;
- 0018 i = find(y>0);
- 0019 <span class="keyword">if</span> (length(i)>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>
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