我正在调用 ggplot 函数
ggplot(data,aes(x,y,fill=category)+geom_bar(stat="identity")
结果是一个条形图,条形图由与类别对应的各种颜色填充。但是,颜色的顺序在条与条之间并不一致。假设有粉色、绿色和蓝色。有些条从下到上呈粉红色、绿色、蓝色,有些则呈绿色、粉红色、蓝色。我没有看到任何明显的模式。
这些顺序是如何选择的?我怎样才能改变它?至少,我怎样才能让 ggplot 选择一致的顺序?
(x,y 和 category) 的类分别是 (integer,numeric 和 factor)。如果我将类别设为有序因子,它不会改变这种行为。
有人知道怎么修这个东西吗?
可重现的例子:
dput(data)
structure(list(mon = c(9L, 10L, 11L, 10L, 8L, 7L, 7L, 11L, 9L,
10L, 12L, 11L, 7L, 12L, 8L, 12L, 9L, 7L, 9L, 10L, 10L, 8L, 12L,
7L, 11L, 10L, 8L, 7L, 11L, 12L, 12L, 9L, 9L, 7L, 7L, 12L, 12L,
9L, 9L, 8L), gclass = structure(c(9L, 1L, 8L, 6L, 4L, 4L, 3L,
6L, 2L, 4L, 1L, 1L, 5L, 7L, 1L, 6L, 8L, 6L, 4L, 7L, 8L, 7L, 9L,
8L, 3L, 5L, 9L, 2L, 7L, 3L, 5L, 5L, 7L, 7L, 9L, 2L, 4L, 1L, 3L,
8L), .Label = c("Down-Down", "Down-Stable", "Down-Up", "Stable-Down",
"Stable-Stable", "Stable-Up", "Up-Down", "Up-Stable", "Up-Up"
), class = c("ordered", "factor")), NG = c(222614.67, 9998.17,
351162.2, 37357.95, 4140.48, 1878.57, 553.86, 40012.25, 766.52,
15733.36, 90676.2, 45000.29, 0, 375699.84, 2424.21, 93094.21,
120547.69, 291.33, 1536.38, 167352.21, 160347.01, 26851.47, 725689.06,
4500.55, 10644.54, 75132.98, 42676.41, 267.65, 392277.64, 33854.26,
384754.67, 7195.93, 88974.2, 20665.79, 7185.69, 45059.64, 60576.96,
3564.53, 1262.39, 9394.15)), .Names = c("mon", "gclass", "NG"
), row.names = c(NA, -40L), class = "data.frame")
ggplot(data,aes(mon,NG,fill=gclass))+geom_bar(stat="identity")