/a></span><span class="op">(</span><span class="va">ex_3</span><span class="op">)</span>
<span class="co">#&gt;             V1        V2        V3          V4     ROWSUM</span>
<span class="co">#&gt; 1   3.04503083  3.934625 -4.513511  0.99013427  3.4562793</span>
<span class="co">#&gt; 2  -1.54091497 -4.673914  4.680151  1.18671480 -0.3479628</span>
<span class="co">#&gt; 3   0.94311489 -4.390760  4.471871  1.14283428  2.1670596</span>
<span class="co">#&gt; 4   0.99425697  2.958406 -4.325231 -1.60856295 -