How to plot plots using different datasets using ggplot2

Question

I am trying to plot a line and a dot using ggplot2. I looked at but it assumes the same dataset is used. What I tried to do is

library(ggplot2)

df = data.frame(Credible=c(0.2, 0.3),
                 len=c(0, 0))

zero=data.frame(x0=0,y0=0)

 ggplot(data=df, aes(x=Credible, y=len, group=1)) +
  geom_line(color="red")+
  geom_point()+
  labs(x = "Credible", y = "")

  ggplot(data=zero, aes(x=x0, y=y0, group=1)) +
  geom_point(color="green")+
  labs(x = "Credible", y = "")

but it generates just the second plot (the dot).

Thank you

stackoverflow.com/questions/7476022/…

CMichael
– CMichael

2021-07-09 12:55:07 +00:00
Commented Jul 9, 2021 at 12:55 — CMichael
– CMichael, Commented Jul 9, 2021 at 12:55

CMichael · Accepted Answer · 2021-07-09 13:03:03Z

1

Given the careful and reproducible way you created your question I am not just referring to the old answer as it may be harder to transfer the subsetting etc.

You initialize a new ggplot object whenever you run ggplot(...).

If you want to add a layer on top of an existing plot you have to operate on the same object, something like this:

ggplot(data=df, aes(x=Credible, y=len, group=1)) +
  geom_line(color="red")+
  geom_point()+
  labs(x = "Credible", y = "") +
  geom_point(data=zero, color="green", aes(x=x0, y=y0, group=1))

Note how in the second geom_point the data source and aesthetics are explicitly specified instead to prevent them being inherited from the initial object.

edited Jul 9, 2021 at 13:03

answered Jul 9, 2021 at 12:54

CMichael

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2 Comments

bird Over a year ago

The second labs(x = "Credible", y = "") is redundant and you can remove it :)

CMichael Over a year ago

yeah copy and pasting not so smart :)

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