an>
      <p class="shortcomment cmt">Takes values from array arr at particular offsets so as to produce a new array.</p><div class="fullcomment"><div class="comment cmt"><p>Takes values from array arr at particular offsets so as to produce a new array.
Offset -1 is mapped to by-name parameter <code>missing</code>.</p><p>Note that each integer I at offset O in <code>offsets</code> works to &quot;take&quot; input[I] to
output[O]. Eg, Array(2,0,1) permutes locations as follows:</p><ul><li>2 to 0</li><li>0 to 