访问 zoo 或 xts 索引 [英] Access zoo or xts index

问题描述

我正在使用动物园对象，购买我的问题也适用于 xts 对象.在我看来，它是一个带有索引的单列向量.在我的情况下，索引是日期向量和一列向量我的数据.一切都很好，只是我想访问日期(从索引).

I am using zoo objects, buy my question also applies to xts objects. It looks to me like it is a one column vector with an index. In my case the index is the vector of dates and the one column vector my data. All is good except that I would like to access the dates (from the index).

例如我有以下结果:

ObjZoo <- structure(c(10, 20), .Dim = c(2L, 1L), index = c(14788, 14789),
                    class = "zoo", .Dimnames = list(NULL, "Data"))
unclass(ObjZoo)
#      Data
# [1,]   10
# [2,]   20
# attr(,"index")
# [1] 14788 14789

我想在变量或向量中获取 14789，但我不知道如何访问它.

I want to get 14789 in a variable or a vector, but I'm not sure how to access it.

推荐答案

从?zoo的帮助中，有两种方便的方法可以访问zoo对象中的数据:

From the help for ?zoo, there are two convenience methods to access the data in zoo objects:

• coredata() 返回zoo对象中的数据
• index() 返回索引

• coredata() returns the data in the zoo object
• index() returns the index

例如:

x.Date <- as.Date("2003-02-01") + c(1, 3, 7, 9, 14) - 1
x <- zoo(rnorm(5), x.Date)

index(x)
[1] "2003-02-01" "2003-02-03" "2003-02-07" "2003-02-09" "2003-02-14"

coredata(x)
[1] -1.2487943  0.8911630  1.2713133 -0.1024638  0.2989194

这篇关于访问 zoo 或 xts 索引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IT屋！