ggplot two way anova line chart

tidyverse
1

hello, I am trying to make a line chart of a model with two binary X and a continous Y. When I specify one of X as the x axis and in continuous scale, the plot is mostly fine, only that the x axis has other values between 0 and 1 (because I specified it as continuous). The code looks like below:

ggplot(mtcars,aes(y=mpg,x=vs,color=as.factor(gear)))+stat_summary(fun='mean',geom='line')

Since the x axis contains other values between 0 and 1, I specify X as a binary variable, but the code didnt work:

ggplot(mtcars,aes(y=mpg,x=as.factor(vs),color=as.factor(gear)))+stat_summary(fun='mean',geom='line')
geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?

Why is that? Please give me some advice. Thank you very much.

2

your first solution, you can control the break points displayed on the x axis

ggplot(mtcars,aes(y=mpg,x=vs,color=as.factor(gear)))+
  stat_summary(fun='mean',geom='line') +
  scale_x_continuous(breaks=c(0,1))
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