s="op">(</span><span class="va">ex_2</span><span class="op">)</span>
<span class="co">#&gt;             V1           V2          V3          V4      ROWSUM</span>
<span class="co">#&gt; 1   1.10068411  2.594680913  9.38260127 16.33230452 29.41027081</span>
<span class="co">#&gt; 2   1.48475660  1.343237643  0.41401952  1.07779944  4.31981320</span>
<span class="co">#&gt; 3   0.81377545  3.031421463  9.50078156 15.38272781 28.72870628</span>
<span class="co">#&gt; 4   1.51258354 -0.155761879  0.46730912 -0.2