问题描述
我想在某个图表上的多个日期添加垂直线.到目前为止，我还没有设法完成这个简单的任务.这是我尝试过的:
I want to add vertical lines on several dates on a certain graph. So far I haven't managed to achieve this simple task. This is what I tried:
> s <- get(getSymbols('nvmi'))["2012::"]
> d1 <- index(s[100])
> d1
[1] "2012-05-24"
> chart_Series(s,TA="addLines(v=d1)")
Error in get.current.chob() : improperly set or missing graphics device
> chart_Series(s)
> abline(v=d1)
# nothing
> add_TA("addLines(v=d1")
Error in `[.data.frame`(lenv$xdata, Env$xsubset) :
undefined columns selected
根据我在此处阅读的内容，我知道 abline 不应该与新的 chart_Series 函数一起使用.无论如何它似乎不起作用.addLines 函数在我尝试过的任何形式中都不起作用 - 普通 addLines、plot(addLines(...))、chart_Series(..., TA="addLines(...)") 或 add_TA("addLines(...)").
From what I have already read here, I know that abline is not supposed to work with the new chart_Series function. It doesn't seem to work anyway. The addLines function does not work in any of the forms I tried - plain addLines, plot(addLines(...)), chart_Series(..., TA="addLines(...)") or add_TA("addLines(...)").
我需要使用 quantmod 的实验版本，因为它解决了我在旧版本中遇到的其他问题.d1 最终会是一个日期列表.
I need to use the experimental version of quantmod because it solved other problems I had with the old version. d1 would eventually be a list of dates.
推荐答案
您不能混合使用 quantmod 图表函数的新旧版本中的函数.如果要使用addLines，则必须使用chartSeries.即使您使用 addLines 和 chartSeries，d1 也应该是 xts 对象，而不是日期时间对象.例如:
You can't mix functions from the old and new versions of quantmod's charting functions. If you want to use addLines, you have to use chartSeries. Even if you use addLines and chartSeries, d1 should be an xts object, not a datetime object. For example:
library(quantmod)
data(sample_matrix)
s <- as.xts(sample_matrix)
chartSeries(s,TA="addLines(v=s[100])")
如果您想使用 chart_Series 添加一条垂直线，请使用 TRUE 值创建一个逻辑 xts 对象，您希望这些线出现在其中，FALSE 否则.例如:
If you want to add a vertical line using chart_Series, create a logical xts object with TRUE values where you want the lines to appear and FALSE otherwise. For example:
l <- xts(!as.logical(s[,1]),index(s))
l[100] <- TRUE
chart_Series(s,TA="add_TA(l,on=1)")
另请注意，您可以在 add_TA 调用中使用 on=-1 将垂直线放在图表后面":
Also note that you can put the vertical line "behind" the chart by using on=-1 in the add_TA call:
chart_Series(s,TA="add_TA(l,on=-1,col='grey',border='grey')")
这篇关于向 quantmod::chart_Series 添加垂直线的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！