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<h1>Piecewise linear fit coder factory.</h1>
<small class="dont-index">Source: <a href='https://github.com/WinVector/RcppDynProg/blob/master/R/vtreat_coders.R'><code>R/vtreat_coders.R</code></a></small>
<div class="hidden name"><code>piecewise_linear_coder.Rd</code></div>
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<div class="ref-description">
<p>Build a piecewise linear fit coder with some parameters bound in.</p>
</div>
<pre class="usage"><span class='fu'>piecewise_linear_coder</span><span class='op'>(</span>
penalty <span class='op'>=</span> <span class='fl'>1</span>,
min_n_to_chunk <span class='op'>=</span> <span class='fl'>1000</span>,
min_seg <span class='op'>=</span> <span class='fl'>10</span>,
max_k <span class='op'>=</span> <span class='fl'>1000</span>
<span class='op'>)</span></pre>
<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
<table class="ref-arguments">
<colgroup><col class="name" /><col class="desc" /></colgroup>
<tr>
<th>penalty</th>
<td><p>per-segment cost penalty.</p></td>
</tr>
<tr>
<th>min_n_to_chunk</th>
<td><p>minimum n to subdivied problem.</p></td>
</tr>
<tr>
<th>min_seg</th>
<td><p>positive integer, minimum segment size.</p></td>
</tr>
<tr>
<th>max_k</th>
<td><p>maximum segments to divide into.</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
<p>a vtreat coder</p>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<pre class="examples"><div class='input'>
<span class='va'>coder</span> <span class='op'><-</span> <span class='fu'>piecewise_linear_coder</span><span class='op'>(</span>min_seg <span class='op'>=</span> <span class='fl'>1</span><span class='op'>)</span>
<span class='fu'>coder</span><span class='op'>(</span><span class='st'>"x"</span>, <span class='fl'>1</span><span class='op'>:</span><span class='fl'>8</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='fl'>1</span>, <span class='fl'>2</span>, <span class='fl'>3</span>, <span class='fl'>4</span>, <span class='fl'>4</span>, <span class='fl'>3</span>, <span class='fl'>2</span>, <span class='fl'>1</span><span class='op'>)</span><span class='op'>)</span>
</div><div class='output co'>#> [1] 1 2 3 4 4 3 2 1
#> attr(,"approx_table")
#> predXs predYs
#> 1 1 1
#> 2 4 4
#> 3 5 4
#> 4 8 1
#> attr(,"method")
#> [1] "linear"</div><div class='input'>
</div></pre>
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