col_idx function

Obtain the index of a column in a data frame (or a list), producing an error if there is a problem.

col_idx(name, df)

Arguments

• name: a character vector giving the names of the columns to look up.
• df: a data.frame or a list object.

Returns

An integer giving the column index of the named column.

Note

Numeric inputs for name are passed through, so this function is safe to use if the input is already a column index.