[R] dropping variables from a data frame inside a function

[David Winsemius]

On Jun 22, 2012, at 5:09 PM, Joseph Boyer wrote:

> Why doesn't this work?
>
>                #Drop a variable name from a data frame
>
> DropLikeSAS <- function(x,df) {
>
>                                df[[x]] <- NULL
>
>                                0
>
>                                }
>
> DropLikeSAS("VarName", DataFrameName)
>
>
> Try it. The column VarName will not be deleted from the data frame  
> DataFrameName.
>
>
> But
>
> x <- "VarName"
> DataFrameName[[x]] <- NULL
>
> Works.
>
>
>
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>
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David Winsemius, MD
West Hartford, CT