<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68060454">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>&gt;    for (size_t i = 0; i &lt; hashVec.n_elem; i++)
&gt;      hashVec[i] = (double) ((size_t) hashVec[i] % secondHashSize);
&gt;  
&gt;    Log::Assert(hashVec.n_elem == numTablesToSearch);
&gt;  
&gt; +  // Compute hashVectors of additional probing bins
&gt; +  arma::mat hashMat;
</pre>
<p><strong>On your first point:</strong> I wondered too when I first saw this - I thought it had something to do with operator precedence but <a href="http://en.cppreference.com/w/c/language/operator_precedence">typecasting precedes modding</a>, so I'm fixing that.</p>

<p><strong>On your second point:</strong> In the beginning I started doing it like that to avoid the copy, but the armadillo spans confused me so I went around it. I'll try to find a way to do it the way you say.</p>

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