我正在尝试使用pch放置其他形状。但是没有给出预期的输出。
legend("topleft",
legend = c("Upper limit ","Estimated","Lower limit"),
col = c("black","black","black"),
pch = c('-','19','-'),
#bty="n",
cex=1.2,
text.col="black",
horiz=F,
inset=c(0.1,0.1)
)