我想将散点图上的点的色阶渐变与绘图上的某些文本的色阶渐变结合起来。我可以按照下面的示例分别执行它们,但我似乎无法将它们放在一起......有没有办法做到这一点?
这是我要组合的两种类型的图(p 和 p1)的示例代码
l <- data.frame(prev=rnorm(1266),
aft=rnorm(1266),
day=as.factor(wday(sample(c(2:6),1266,replace=TRUE),abbr=TRUE, label=TRUE)),
month=as.factor(month(Sys.Date()+months(sample(0:11,1266,replace=TRUE)),abbr=TRUE, label=TRUE)),
ind=c(1:1266))
cors <- ddply(l, c("month", "day"), summarise, cor = round(cor(prev, aft), 3))
# below the text gains the colour gradient
p <- ggplot(l, aes(x=prev, y=aft)) +
geom_point() +
scale_colour_gradient(low = "red", high="blue")+
facet_grid(day~month, scales="free_x")+
geom_text(data=cors,aes(label=paste("r= ",cor,sep=""), size=abs(cor), colour=cor), x=Inf, y=Inf, vjust=1, hjust=1, show_guide=FALSE)+
geom_hline(aes(yintercept=0))+
geom_smooth(method="loess")
p
# below the points gain the colour gradient
p1 <- ggplot(l, aes(x=prev, y=aft)) +
geom_point(aes(colour=ind)) +
scale_colour_gradient("gray")+
facet_grid(day~month, scales="free_x")+
geom_text(data=cors,aes(label=paste("r= ",cor,sep=""), size=abs(cor), colour=cor), x=Inf, y=Inf, vjust=1, hjust=1, show_guide=FALSE)+
geom_hline(aes(yintercept=0))+
opts(legend.position="none") +
geom_smooth(method="loess")
p1