an><span class="op">(</span><span class="fl">1</span><span class="op">:</span><span class="fl">6</span>, corr<span class="op">=</span><span class="cn">FALSE</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>      [,1] [,2] [,3] [,4]</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1,]   NA    1    2    3</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [2,]    1   NA    4    5</span>
<span class="r-out co"><span class="r-pr">#&gt;<