我有一个如下所示的df: ? df<-structure(list(Date = c(141, 111, 71, 153, 57, 8, 83, 83, 111,
99, 99, 43, 43, 22, 15, 22, -7, 153, 15, 29, 71, 29, 57, -7,
127, 141, 127, 8), Result = c(173, 156, 154, 131, 154, 126, 171,
114, 132, 133, 177, 188, 135, 179, 177, 152, 171, 185, 117, 117,
174, 193, 161,