/* * call-seq: * dvector.sub!(number) -> dvector * dvector.sub!(other) -> dvector * * When argument is a number, each entry x in _dvector_ is replaced by x - _number_. * When argument is a vector, each entry x in _dvector_ is replaced by x - * the corresponding entry in the _other_ vector. * * a = Dvector[ 11, -5, 2 ] * a.sub!(3) -> Dvector[ 8, -8, -1 ] * a -> Dvector[ 8, -8, -1 ] * b = Dvector[ 7, 4, -10 ] * a = Dvector[ 11, -5, 2 ] * a.sub!(b) -> Dvector[ 4, -9, 12 ] * a -> Dvector[ 4, -9, 12 ] */ VALUE dvector_sub_bang(VALUE ary, VALUE arg) {