plot.xts + abline 不太准确? [英] plot.xts + abline not quite accurate?

问题描述

我正在使用 xtsExtra 来绘制一些 xts 对象的散点图，并想绘制一条穿过零的水平线，但看起来它在错误的位置...请看下面的代码?这是一个错误吗?

I am using xtsExtra to plot some scatter graphs of xts objects and wanted to draw a horizontal line through zero but it looks like its in the wrong place...please see the code below? is this a bug?

set.seed(123)
require(xts)
f <- xts(rnorm(100,0.0001,0.003),Sys.Date()-c(100:1))
f1 <- xts(rnorm(100,0.0001,0.003),Sys.Date()-c(100:1))
require(xtsExtra)
plot(f,f1)
abline(h=0,col='red')

推荐答案

Jeff Ryan 可能已经回答了这个问题 这里:

Jeff Ryan may have answered this here:

试试，

abline(v=.index(X)[50], col="red")

注意.index 中的点".事实是 xts 使用内部POSIXct(like) x 轴的时间，因此您需要以这种方式访问​​它.

Note the "dot" in .index. The fact is that xts uses the internal POSIXct(like) time for the x-axis, so you need to access it that way.

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