If condition inside ggplot

Asked Mar 19 '19 at 18:54

Active Mar 19 '19 at 19:09

Viewed 4,262 times

Why if statement does not work inside ggplot function but works as a last line:

index <- 1

This works:

ggplot(mtcars, aes(wt, mpg))+
  geom_line()+
  if(index==1) geom_point()

However, when I move the if statement, it does not work:

ggplot(mtcars, aes(wt, mpg))+
  if(index==1) geom_point()+  #or if(index==1) {geom_point()}+
  geom_line()

Is there anyway to use if statement inside ggplot, not in the last line? I know I can do the following, but I am curious if I can use it inside ggplot:

p <-  ggplot(mtcars, aes(wt, mpg))+
      geom_line()

if(index==1) p <- p + geom_point()

edited Mar 19 '19 at 19:09

asked Mar 19 '19 at 18:54

Soheil

6

Put it in curly braces, i.e. `{if(index==1) geom_point()} + ` – joran Mar 19 '19 at 18:55
1

Just put your assignment inside the if statement: `if (index==1) p <- p + geom_point()` – divibisan Mar 19 '19 at 18:56
Just tried @joran's suggestion and it works: `{if(index==1) geom_point()}`. – Rui Barradas Mar 19 '19 at 18:58
@joran I was exactly looking for this. Do you want to put as an answer, I looked everywhere. – Soheil Mar 19 '19 at 18:58
@Soheil No, someone found a good duplicate with both approaches. – joran Mar 19 '19 at 19:00

If condition inside ggplot

0 Answers0