我尝试使用来在x轴上绘制月份ggplot2
,但是月份名称会自动显示为带有小数的数字。如何强制脚本绘制由数字组成的月份名称?我使用以下代码:
ggplot(df3, aes(x = month, y = PM)) +
geom_line(aes(col = factor(travel))) +
xlab("Month") +
ylab(expression(paste("PM(",mu,"g/", m^3,")", sep="")))
数据如下:
df3 <- structure(list(month = c(9, 10, 9, 10, 1, 2, 3, 4, 5, 9, 10,
1, 2, 3, 4, 5, 9, 10, 11, 12, 1, 2, 3, 4, 5, 11),
travel = c("Diesel bus",
"Diesel bus", "Diesel bus", "Diesel bus", "Diesel bus", "Diesel car",
"Diesel car", "Diesel car", "Diesel car", "Diesel car", "Bicycle",
"Bicycle", "Bicycle", "Bicycle", "Bicycle", "Gasoline car", "Gasoline car",
"Gasoline car", "Gasoline car", "Gasoline car", "Elcectric bus",
"Elcectric bus", "Elcectric bus", "Elcectric bus", "Elcectric bus",
"Elcectric bus"),
PM = c(22.6496512922918, 18.1829352554303,
28.776408085308, 30.1441935430254, 23.8938954711914, 21.8288997171693,
22.7177263732526, 29.8606175809457, 30.530998468399, 30.1288699182287,
28.4038889338888, 19.4761033463478, 18.9449487406838, 20.3568456145256,
16.5431814479828, 12.8668955993652, 21.6255497367427, 21.8725590587368,
14.7631275227865, 12.5790810203552, 15.1794028663635, 19.3508881492176,
15.895525373979, 15.3945024820964, 15.5982689292758, 12.1219868087769
)),
.Names = c("month", "travel", "PM"),
row.names = c(NA, -26L),
class = "data.frame")
你也可以使用 scale_x_discrete
ggplot(df3, aes(x=month, y=PM)) +
geom_line(aes(col = factor(travel)))+
xlab("Month")+ ylab (expression(paste("PM(",mu, "g/", m^3,")", sep=""))) +
scale_x_discrete(labels=month.abb)
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