<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66460836">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>> + arma::vec d(n), v(n), z(n + 1);
> + int k = 0;
> + v[0] = 0.0;
> + z[0] = -INF;
> + z[1] = +INF;
> + for (size_t q = 1; q <= n - 1; ++q)
> + {
> + float s = ( (f[q] + q * q)-( f[v[k]] + v[k] * v[k]) ) / (2 * q - 2 * v[k]);
> + while (s <= z[k])
> + {
> + --k;
> + s = ( (f[q] + q * q) - (f[v[k]] + v[k] * v[k]) ) / (2 * q - 2 * v[k]);
> + }
> +
> + k++;
> + v[k] = (double)q;
</pre>
<p>Forgive me if I am picky about this, I think static_cast is a better choice than old style c cast at here</p>
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