将data.frame排序到列

I have a question regarding the use of the function order (), I have the following data.frame and I am using the following statement but I can not sort the column, and can not find the error. I want this column Tag_PHASE ordered from lowest to highest.

我有一个关于函数order（）的使用的问题，我有以下data.frame并且我使用以下语句但我无法对列进行排序，并且无法找到错误。我希望此列Tag_PHASE从最低到最高排序。

    Tag_PHASE   Num_EPC
1   101.0   1
2   126.0   1
3   70.0    1
4   73.0    1
5   78.0    3
6   81.0    1
7   84.0    1
8   87.0    1
9   90.0    1
10  92.0    3

a<-DF_TAG_PHASE_EPC_counter[order(DF_TAG_PHASE_EPC_counter$Tag_PHASE), ]

1 个解决方案

#1

Here is an attempt:

这是一个尝试：

DF_TAG_PHASE_EPC_counter <- 
   data.frame(Tag_PHASE = runif(10)*100, Num_EPC = sample(c(1,3), 10,prob = c(.7,.3), replace = T))
DF_TAG_PHASE_EPC_counter

DF_TAG_PHASE_EPC_counter[order(DF_TAG_PHASE_EPC_counter$Tag_PHASE),]

Note: You are assigning the results to a:

注意：您将结果分配给：

a <- DF_TAG_PHASE_EPC_counter[order(DF_TAG_PHASE_EPC_counter$Tag_PHASE),]

So to see the results you'll have to print a

所以要查看结果，你必须打印一个

Here is a simpler way to do this:

这是一种更简单的方法：

library(data.table)
DT <- setDT(DF_TAG_PHASE_EPC_counter)
DT[order(Tag_PHASE)]

#1