r - 在 R 中结合线和条形图图例

Question

有没有办法做到这一点？

我当前的代码：

barplot(to_plot_bar,col=cm.colors(6,alpha=1),width=0.75,space=0.2,names.arg=x)
lines(dat_dens,lty=1,col="black");
legend("topright",ltext,bty="n",fill=cm.colors(6),
lty = c(0,0,0,0,0,0,1), lwd = c(0,0,0,0,0,1));

生成这样的图例。

Answer 1

试试这个

ltext1 <- c(ltext,"emp") # this is not necessary if you already added 
legend("topright",ltext1,bty="n",col=c(cm.colors(6),"black"),pch=c(rep(15,6),-1),
       lty = c(0,0,0,0,0,0,1));