小编Nat*_*ate的帖子

这是我的代码:

#data
sites <- 
  structure(list(site = c(928L, 928L, 928L, 928L, 928L, 928L, 928L,
                          928L, 928L, 928L, 928L, 928L, 928L, 928L,
                          928L, 928L, 928L, 928L, 928L, 928L, 928L,
                          928L, 928L, 928L, 928L, 928L), 
                 date = c(13493L, 13534L, 13566L, 13611L, 13723L,
                          13752L, 13804L, 13837L, 13927L, 14028L,
                          14082L, 14122L, 14150L, 14182L, 14199L,
                          16198L, 16279L, 16607L, 16945L, 17545L,
                          17650L, 17743L, 17868L, 17941L, 18017L, 18092L),
                 y = c(7L, 7L, 17L, 18L, 17L, 17L, 10L, 3L, 17L, 24L, 
                       11L, 5L, 5L, 3L, 5L, 14L, 2L, 9L, …