<p>In <a href="https://github.com/mlpack/mlpack/pull/753#discussion_r73803338">src/mlpack/methods/ne/utils.hpp</a>:</p>
<pre style='color:#555'>> + return dist(rng);
> +
> +}
> +
> +// Return a random float between [x, y]
> +double RandFloat(double x, double y) {
> + boost::random::uniform_real_distribution<> dist(x, y);
> + return dist(rng);
> +}
> +
> +/**
> + * Definitions of other functions.
> + */
> +
> +// Return the sign of a number.
> +template <typename T> int sgn(T val) {
</pre>
<p>What about using <code>arma::sign(val)</code> take a look at: <a href="http://arma.sourceforge.net/docs.html#misc_fns">http://arma.sourceforge.net/docs.html#misc_fns</a> for more informations.</p>
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