将列附加到数据帧 - R [英] Appending column to a data frame - R

问题描述

可以在以下情况下将列附加到数据框？

Is it possible to append a column to data frame in the following scenario?

dfWithData <- data.frame(start=c(1,2,3), end=c(11,22,33))
dfBlank <- data.frame()

..如何从 dfWithData 添加列开始 dfBlank ？

..how to append column start from dfWithData to dfBlank?

数据帧初始化时，应该添加数据。我可以这样做：

It looks like the data should be added when data frame is being initialized. I can do this:

dfBlank <- data.frame(dfWithData[1])

但是如果可以将列附加到空（但inti）

but I am more interested if it is possible to append columns to an empty (but inti)

推荐答案

我建议简单地对从RODBC呼叫中获取的数据帧进行子集化。如下：

I would suggest simply subsetting the data frame you get back from the RODBC call. Something like:

df[,c('A','B','D')]

也许，或者你也可以使用他们的数字位置来分组你想要的列，即

perhaps, or you can also subset the columns you want with their numerical position, i.e.

df[,c(1,2,4)]

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