 class='co'>## Do not modify t2, but create a new array object t3. </span>
<span class='co'>## Remove some borders without adding new borders:</span>
<span class='no'>t3</span> <span class='kw'>&lt;-</span> <span class='fu'>ring_modify</span>(<span class='kw'>ring.data</span> <span class='kw'>=</span> <span class='no'>t2</span>, <span class='kw'>del</span> <span class='kw'>=</span> <span class='fu'><a href='https://www.rdocumentation.org/packages/base/topics/c'>c</a></span>(<span class='fl'>1</span>, <span 