<p>I should also say, you won't see much speedup for a 10x10 matrix, try more like 10000 points and 100 features. I think that you would also be benefited by looping columnwise instead:</p>
<pre><code>#pragma omp parallel for
for (size_t i = 0; i < mat.n_cols; ++i)
{
// Each threads works on a single column.
for (size_t j = 0; j < mat.n_rows; ++j)
{
if (mat(j, i) < threshold)
outmat(j, i) = 0;
else
outmat(j, i) = 1;
}
}
</code></pre>
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