当基础时间序列为月频率时，如何从时间序列索引中获取年份？
我想从时间序列索引中提取年份（基础时间序列是每月频率）。我想要这样做的原因是创建一个年度轴，例如
plot(myts)
axis(1, at = year(time(myts)), labels = FALSE)
# note I know 'year()' does not work :)
因为如果我只是绘制它，R 会任意（？）创建一个时间轴。通常是两年甚至五年的轴，这有时是不合适的。
tsp(myts)
[1] 1966.000 1974.917 12.000
I´d like to extract years from a time series index (the underlying time series is of monthly frequency). The reason I want to do it is creating a yearly axis, e.g.
plot(myts)
axis(1, at = year(time(myts)), labels = FALSE)
# note I know 'year()' does not work :)
because if I just plot it, R arbitrarily(?) creates a time axis. Often it's a two or even 5 year axis which makes is inappropriate sometimes.
tsp(myts)
[1] 1966.000 1974.917 12.000
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我找到了自己的解决方案。也许这对其他人也有帮助。此外，我认为这不太聪明......所以我期待您的建议。
编辑：找到了一个更优雅的解决方案：
根据@matty T pain，它也适用于
ts（请参阅评论）。I found an own solution. Maybe this helps someone else, too. Besides I think it's not overly smart... so I am looking forward to your suggestions.
EDIT: found a more elegant solution:
according to @matty T pain it also works for
ts(see comments).我对你的数据不熟悉，但如果是时间序列类（ts），那么你可以使用window函数：
window(myts,start="*beginyear*", end="*endyear*")如果您无法做到这一点，也许您可以使用此处的一些建议：
http://r.789695.n4 .nabble.com/Year-and-Month-extraction-from-Date-object-td904011.html
马特
I am not familiar with your data, but if it is a time series class (ts), then you can use the window function:
window(myts,start="*beginyear*",end="*endyear*")If you cannot do that, maybe you can use some of the suggestions here:
http://r.789695.n4.nabble.com/Year-and-Month-extraction-from-Date-object-td904011.html
Matt