在data.frame或cbind中使用变量值作为列名

Is there a way in R to have a variable evaluated as a column name when creating a data frame (or in similar situations like using cbind)?

在R中是否有一种方法在创建数据帧时将变量作为列名进行计算(或者在类似的情况下，如使用cbind)?

For example

例如

a <- "mycol";
d <- data.frame(a=1:10)

this creates a data frame with one column named a rather than mycol.

这将创建一个数据框架，其中一个列名为a而不是mycol。

This is less important than the case that would help me remove quite a few lines from my code:

这比帮助我从代码中删除几行代码的情况要重要得多:

a <- "mycol";
d <- cbind(some.dataframe, a=some.sequence)

My current code has the tortured:

我现在的代码有折磨:

names(d)[dim(d)[2]] <- a;

which is aesthetically barftastic.

这是审美barftastic。

3 个解决方案

#1

> d <- setNames( data.frame(a=1:10), a)
> d
   mycol
1      1
2      2
3      3
4      4
5      5
6      6
7      7
8      8
9      9
10    10

#2

Is structure(data.frame(1:10),names="mycol") aesthetically pleasing to you? :-)

结构(data.frame(1:10)，names="mycol")对你来说是否美观?:-)

#3

just use colnames after creation. eg

创建后只需使用colname。如

a <- "mycolA"
b<- "mycolB"
d <- data.frame(a=1:10, b=rnorm(1:10))
colnames(d)<-c(a,b)
d
mycolA     mycolB
 1 -1.5873866
 2 -0.4195322
 3 -0.9511075
 4  0.2259858
 5 -0.6619433
 6  3.4669774
 7  0.4087541
 8 -0.3891437
 9 -1.6163175
 10  0.7642909

#1

> d <- setNames( data.frame(a=1:10), a)
> d
   mycol
1      1
2      2
3      3
4      4
5      5
6      6
7      7
8      8
9      9
10    10

#2