Increasing minimum point size in ggplot geom_point

3
votes

I am using following data and code: 

> 
> dput(ddf)
structure(list(xx = c("aa", "bb", "cc"), gp = c("one", "two", 
"one"), yy = c(5L, 10L, 15L)), .Names = c("xx", "gp", "yy"), class = "data.frame", row.names = c(NA, 
-3L))
> 
> 
> ddf
  xx  gp yy
1 aa one  5
2 bb two 10
3 cc one 15
> 
> ggplot(ddf)+geom_point(aes(x=xx, y=yy, size=gp))
>

enter image description here

The smaller point size here is really very small and is hardly visible. It becomes even more obscure if it is colored. Can the smaller point size be increased so that it is clearly visible?

1
rggplot2

1 Answers

5
votes

You will have to use the range parameter inside scale_size_discrete like this for example:

ggplot(ddf) +
  geom_point(aes(x=xx, y=yy, size=gp)) +
  scale_size_discrete(range=c(3,5))

which gives the following result: enter image description here