<p>I'm not sure this is necessary, due to the reasons listed below. In fact, I'd argue it's actually counterproductive. Using + and % instead of || and &amp;&amp; makes the code harder to interpret and less efficient.</p>

<p>Reasoning is as follows. MLPACK requires a C++11 compiler.  The lowest version of gcc with sufficient C++11 support is gcc 4.8, which is in both Ubuntu 14.04 and RHEL 7.  Ubuntu 14.04 has Armadillo 4.200, while RHEL 7 uses EPEL 7, which currently has Armadillo 4.320 (... nudge, nudge).</p>

<p>Support for &amp;&amp; and || operators is present in Armadillo 4.200.</p>

<p><a href="https://launchpad.net/ubuntu/+source/armadillo/">https://launchpad.net/ubuntu/+source/armadillo/</a><br>
<a href="https://apps.fedoraproject.org/packages/armadillo-devel">https://apps.fedoraproject.org/packages/armadillo-devel</a></p>

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