Match row name column

Automatically detect row names column, if defined.

matchRownameColumn(object, ...)

# S4 method for data.frame
matchRownameColumn(
  object,
  choices = c("rn", "row.name", "row.names", "rowname", "rownames")
)

# S4 method for DataFrame
matchRownameColumn(
  object,
  choices = c("rn", "row.name", "row.names", "rowname", "rownames")
)

Arguments

object	Object.
choices	character. Column name choices to use internally for matching. Note that case-insensitive matching is performed against make.names() return internally. Either dots (".") or underscores ("_") used as word separators will match.
...	Additional arguments.

Value

character(1) or NULL.

• data.table: "rn".

• tibble: "rowname".

Details

The data.table package uses "rn" by default, whereas tibble uses "rowname".

Note

Updated 2020-01-18.

Examples

data(data.table, tbl_df, package = "AcidTest")

## data.table ====
matchRownameColumn(data.table)
#> [1] "rn"

## tbl_df ====
matchRownameColumn(tbl_df)
#> [1] "rowname"