How to increase size of the points in ggplot2, sim

问题:

I have the following dummy code:

dt<-data.frame(country=letters[1:20],val=rnorm(20),siz=rnorm(20))
qplot(x=country,y=val,data=dt,geom="point",size=siz)

Now I want to increase the relative size of the points, since the resulting smallest point is too small. Is this possible to do by changing one parameter, like cex in base plots?

回答1:

You want scale_size() and it's argument range (or to according to the ggplot website):

qplot(x=country,y=val,data=dt,geom="point", size=siz) + 
    scale_size(range = c(2, 10))

Fiddle with the range to get suitable minimum/maximum sizes.

回答2:

Yes. Change the scale's range:

p <- qplot(x=country,y=val,data=dt,geom="point",size=siz)
p + scale_size_continuous(range = c(3,8))