/* * call-seq: * dvector.where_max -> int or nil * dvector.where_first_max -> int or nil * * Returns the index of the first entry with the maximum value in _dvector_. Returns <code>nil</code> if * _dvector_ is empty. * * a = Dvector[ 1, 2, 3, 4, 5, 4, 3, 5, 2 ] * a.where_max -> 4 * Dvector[].where_max -> nil */ VALUE dvector_where_max(VALUE ary) {