<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66466139">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  }
&gt; +  return OutImage;  
&gt; +}
&gt; +
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +CubeType StructuredForests&lt;MatType, CubeType&gt;::
&gt; +RGB2LUV(CubeType&amp; InImage)
&gt; +{
&gt; +  //assert type is double or float.
&gt; +  double a, y0, maxi;
&gt; +  a = pow(29.0, 3) / 27.0;
&gt; +  y0 = 8.0 / a;
&gt; +  maxi = 1.0 / 270.0;
&gt; +
&gt; +  arma::vec table(1025);
&gt; +  for (size_t i = 0; i &lt; 1025; ++i)
</pre>
<p>you can call table.n_elems, this way you only need to change the value 1025 once only(if you need to change it in the future)</p>

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