[英]R xts how to add calculated column
I have two series that I have joined in a single xts object using merge(foo, footoo, all = FALSE)
. 我有两个系列,我使用
merge(foo, footoo, all = FALSE)
在一个xts对象中加入。
Now I need to take a new vector = foo/footoo : 现在我需要一个新的vector = foo / footoo:
I'm trying to avoid use of cbind
because I can't bring myself to haphazardly join an unindexed vector of data to my safely ordered xts object. 我试图避免使用
cbind
因为我无法随意将未经索引的数据向量加入到我安全排序的xts对象中。
Do I need to coerce to something like data.frame (for which I would know how to do this)? 我是否需要强制使用data.frame(我知道如何做到这一点)? But if so, how do I keep my index intact?
但如果是这样,我如何保持我的索引完整? It's the ordering that has me nervous.
这是令我紧张的顺序 。
I'm very new to R and this is the first time I've worked with time series in R, so I apologize if this question has an answer that is obvious to all but me. 我是R的新手,这是我第一次使用R中的时间序列,所以如果这个问题的答案对我来说很明显,我会道歉。
Thanks in advance. 提前致谢。
Using transform
for example, you can create a new column like this: 例如,使用
transform
,您可以创建一个新列,如下所示:
obj <- merge(foo, footoo, all = FALSE)
transform(obj, newfoo = foo/footoo )
You can safely do as below. 您可以安全地执行以下操作。
xts
will always cbind
or merge
by time index. xts
将始终按时间索引进行cbind
或merge
。
mergedXTS <- merge(foo, footoo, all=FALSE)
mergedXTS$newfoo <- mergedXTS$foo/mergedXTS$footoo
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