Armadillo generates the same random numbers
<p>I generate a matrix with randoms using Armadillo package (v.7.300.1) under cygwin64 (or minGW):</p>

<pre><code>#include&lt;armadillo&gt;

int main(){
  arma::mat(3,3, arma::fill::randu).print();
  return 0;
}
</code></pre>

<p>The program (after re-build or re-run) always generates:</p>

<pre><code>0.6900  0.5548  0.2074    
0.5054  0.3784  0.6263    
0.5915  0.2577  0.3401
</code></pre>

<p>Why is it always the same? What's wrong?</p>