使用存储变量中的符号名称重命名数据框列？

Question

我正在构建一个函数，该函数需要我重命名数据框中的列，其中原始列名存储在用户输入的变量中。

#self$options$DV is a string identifying the column of interest, such as 'chosenvarname':    

DVlabel <- self$options$DV

但是，dplyr::rename 函数在使用此变量或其符号链接时不起作用：

df1 <-plyr::rename(df1,c(DVlabel='DV'))

df1 <-plyr::rename(df1,c(self$options$DV='DV'))

即使将 DVlabel 设置为等于数据框中的有效列名，它仍然不起作用

它只有在使用实际列名时才能正常工作，这让我觉得这个函数不适用于符号链接：

df1 <-plyr::rename(df1,c(OriginalColumnName='DV'))

Is there another way to use the column name identified in self$options$DV as the basis for renaming that same column to something else? 

Put differently, is there any way to rename a column using symbolic links to the column name that don't otherwise exist in the data? 

Alternatively, is there some way to construct a column reference, such as data$var1, where the "var1" component is extracted from some other variable (e.g., DVlabel or self$options$DV?)

Answer 1

我通过使用以下重命名列找到了解决此问题的方法：

colnames(df1)[colnames(df1) == self$options$DV] <- 'DV'