I am new to ggplot2. I would like to create a line plot that has points on them where the points are filled with different colors than the lines (see the plot below).
Suppose the dataset I am working with is the one below:
set.seed(100)
data<-data.frame(dv=c(rnorm(30), rnorm(30, mean=1), rnorm(30, mean=2)),
iv=rep(1:30, 3),
group=rep(letters[1:3], each=30))
我尝试了以下代码：
p<-ggplot(data, aes(x=iv, y=dv, group=group, pch=group)) + geom_line() + geom_point()
p + scale_color_manual(values=rep("black",3))+ scale_shape(c(19,20,21)) +
scale_fill_manual(values=c("blue", "red","gray"))
p + scale_shape(c(19,20,21)) + scale_fill_manual(values=c("blue", "red","gray"))
但我没有得到我想要的。我希望有人能指出我正确的方向。谢谢！
scale_fill_manual(), scale_shape_manual() and scale_colour_manual()仅当您已设置时才可以使用fill=, shape= or colour=在 - 的里面aes().
要仅更改您应该添加的点的颜色colour=group inside geom_point() call.
ggplot(data, aes(x=iv, y=dv, group=group,shape=group)) +
geom_line() + geom_point(aes(colour=group)) +
scale_shape_manual(values=c(19,20,21))+
scale_colour_manual(values=c("blue", "red","gray"))
