r语言 - geom_line在一个图上使用几条线

Question

我目前正在尝试做一个线形图，代表3年来各种类型手术的医生数量的演变(每一行)，我的数据框如下:

type of operation     number of doctors        year
ambulatoire             12                     2019
externe                 150                    2019
ambulatoire             19                     2020
externe                 3                      2020

我试过下面的代码，但它似乎不工作…有谁能帮忙吗?

ggplot(df) +
geom_line(aes(x = df$year, y = df$"number of doctors", color = df$"type of operation"))

Answer 1

试试这个

ggplot(df) +
geom_line(aes(x = year,
y = `number of doctors`, 
color = `type of operation`))

Answer 2

试试这个

library(ggplot2)
df <-
data.frame(
type_of_operation = c("ambulatoire", "externe"),
number_of_doctors = c(12, 150, 19, 3),
year = c(2019, 2019, 2020, 2020)
)
ggplot(df, aes(x = year, y = number_of_doctors, color=type_of_operation)) +
geom_line()

PS:如果你想在变量名中保留空格，请使用引号:'而不是">