<p>In <a href="https://github.com/mlpack/mlpack/pull/749#discussion_r75930415">src/mlpack/methods/lsh/objectivefunction.hpp</a>:</p>
<pre style='color:#555'>&gt; +    //! Data points for y-axis.
&gt; +    const arma::mat* yData;
&gt; +};
&gt; +
&gt; +/**
&gt; + * Returns the value of the objective function for some coordinates (alpha,
&gt; + * beta, gamma).
&gt; + * This is the mean squared error for the current parameters or coordinates.
&gt; + */
&gt; +double DefaultObjectiveFunction::Evaluate(const arma::mat&amp; coordinates) const
&gt; +{
&gt; +  // Use extra variables to make code readable.
&gt; +  double alpha = coordinates(0, 0);
&gt; +  double beta = coordinates(1, 0);
&gt; +  double gamma = coordinates(2, 0);
&gt; +  double M = (double) NumFunctions();
</pre>
<p>You can mark these const.</p>

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