' or 'yes' are specified then opt.select := 1.

</p>
<p>
Note:

</p>
<ul>
  <li>That the enumerator names must be distinct from the field names.</li>
  <li>That only one value can be assigned to a field, if multiple values
are required they must placed in a cell array.</li>
  <li>To match an option that starts with a digit, prefix it with 'd_', so
the field 'd_3d' matches the option '3d'.</li>
  <li>OPT can be an object, rather than a structure, in which case the passed
options are assigned to properties.</