英文:
How to create a dataframe with a column name conditional on an object's value in R?
问题
我想创建一个包含一个列的数据框，该列的值取决于另一个对象的值。
这里是一个示例，我想要我的列被称为“conditional_colname”：
x = "conditional_colname"
df <- data.frame(x = c(1, 2, 3))
df
> x
1 1
2 2
3 3
我可以尝试以下 tidy evaluation中的间接语法，但会返回错误：
data.frame({{x}} := c(1, 2, 3))
> Error in `:=`({ : could not find function ":="
我可以通过使用 rename 函数和 tidy evaluation语法中的间接方法 来解决问题，如下所示：
df %>% rename({{x}} := x)
> conditional_colname
1 1
2 2
3 3
但这涉及创建一个带有错误名称的数据框，然后重命名它，是否有从数据集创建时就完成的选项？
英文:
I want to create a dataframe with a column whose value depends on another object's value.
Here's an example, I want my column to be called "conditional_colname":
x = "conditional_colname"
df <- data.frame(x = c(1, 2, 3))
df
> x
1 1
2 2
3 3
I could try the following indirection syntax in tidy evaluation, but it returns an error:
data.frame({{x}} := c(1, 2, 3))
> Error in `:=`({ : could not find function ":="
I can sort out the problem through the use of the rename function and indirection in tidy evaluation syntax, as in:
df %>% rename({{x}} := x)
> conditional_colname
1 1
2 2
3 3
but that involves creating the dataframe with a wrong name and then renaming it, is there any option to do it from the creation of the dataset?
答案1
得分: 4
{{..}}可以与tibbles一起使用 -
library(tibble)
library(rlang)
df <- tibble({{x}} := c(1, 2, 3))
df
# 一个 tibble: 3 × 1
# conditional_colname
# <dbl>
#1 1
#2 2
#3 3
使用data.frame的解决方案是使用setNames。
df <- setNames(data.frame(c(1, 2, 3)), x)
英文:
{{..}} can be used with tibbles -
library(tibble)
library(rlang)
df <- tibble({{x}} := c(1, 2, 3))
df
# A tibble: 3 × 1
# conditional_colname
# <dbl>
#1 1
#2 2
#3 3
A solution with data.frame would be with setNames.
df <- setNames(data.frame(c(1, 2, 3)), x)
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