Chapter 8 4번 문제

ggplot(data=iris,aes(x=Sepal.Length,y=Sepal.Width,shape=Species,color=Species))+geom_point(size=6,alpha=0.5)+xlim(c(4,8))+scale_x_continuous(breaks=c(5,6,7,8))+ylim(c(2.0,4.5))+labs(title="Scatterplot",subtitle="Sepal.Length Vs Sepal.Width",color="Species",caption="Source: iris")+theme_minimal()

## Scale for 'x' is already present. Adding another scale for 'x', which will
## replace the existing scale.