R 将字幕添加到plot.xts

R 将字幕添加到plot.xts,r,plot,xts,subtitle,R,Plot,Xts,Subtitle,有没有办法在plot.xts中添加类似于in base plot的字幕 plot(xts(rnorm(100), order.by = as.Date(1:100)), sub = "Subtitle") plot(rnorm(100), sub = "Subtitle", type = "l")

有没有办法在plot.xts中添加类似于in base plot的字幕

plot(xts(rnorm(100), order.by = as.Date(1:100)), sub = "Subtitle")
plot(rnorm(100), sub = "Subtitle", type = "l")