<p>In <a href="https://github.com/mlpack/mlpack/pull/684#discussion_r66616668">src/mlpack/tests/test_tools.hpp</a>:</p>
<pre style='color:#555'>> @@ -35,4 +34,9 @@
>
> #endif
>
> +// Require the approximation L to be within a relative error of E respect to the
> +// actual value R.
> +#define REQUIRE_RELATIVE_ERR( L, R, E ) \
> + BOOST_REQUIRE_LE( abs((R) - (L)), (E) * (R))
</pre>
<p>This will fail if R is negative. I think maybe a better choice here is to use the Boost test tools implementation... by default <code>BOOST_REQUIRE_CLOSE()</code> checks both the condition above and also | R - L | <= E * |L|, which works for nearest neighbor search, but not furthest neighbor search (unless you, as an argument, set <code>E = e(1 + e)</code>). So you could do that, or you could look at <code>boost/test/test_tools.hpp</code> and see how <code>BOOST_REQUIRE_CLOSE</code> is defined, and you can develop a new macro that uses <code>boost::test_tools::check_is_close</code> with the <code>FPC_WEAK</code> comparison type, and I think that would work for what you are doing.</p>
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