/* * call-seq: * dtable.atan2(number) -> a_dtable * dtable.atan2(other) -> a_dtable * * When argument is a number, this operation returns a copy of _dtable_ with each entry x replaced by the angle whose tangent is x/_number_. * When argument is a data array, this operation returns a copy of _dtable_ with each entry x replaced * by the angle whose tangent is x divided by the corresponding entry in the _other_ data array. */ VALUE dtable_atan2(VALUE ary, VALUE arg) {