R - 更改图例 label

Question

I want to change the legend label: instead of the color hex code put "speed", "temp" and "pressure".

  ggplot(f1, aes(timestamp)) +
  geom_point(aes(y=speed, color="#e41a1c")) +
  geom_point(aes(y=pressure, color="#377eb8")) +
  geom_point(aes(y=temperature, color="#4daf4a"))

Answer 1

you can try this:

ggplot(f1, aes(timestamp)) +
geom_point(aes(y=speed, color="speed")) +
  geom_point(aes(y=pressure, color="pressure")) +
  geom_point(aes(y=temperature, color="temperature"))

to adjust the colours you can do this:

ggplot(f1, aes(timestamp)) +
geom_point(aes(y=speed, color="speed")) +
  geom_point(aes(y=pressure, color="pressure")) +
  geom_point(aes(y=temperature, color="temperature"))+
  scale_color_manual("variable", values=c("red", "yellow", "blue")) #or your hex-codes