once_only: Efficiently find rows where a the value appears only once in...
In MarkGoble/mishMashr: Tools To Help With The Little Annoyances In Life

Description Usage Arguments Details Value Examples

View source: R/once_only.R

Returns a data frame of values which only appear once in a df column.

1	once_only(data_frame, column, return_column_only = TRUE)

`data_frame`	a data frame to read in
`column`	the column in the data frame to check
`return_column_only`	should the function return the whole data frame or just the column?

Returns only the rows from a data frame if there is only one instance of the value in the specified column. This method is more efficient than grouping by the column and then filtering for rows with a count == 1.

Setting the return_column_only = TRUE will return the data frame with all of the instances where the value of column appears more than once removed.

A dataframe of values from the column which aren't duplicated.

mtcars$model <- rownames(mtcars)
# just the values from the column which appear only once
once_only(mtcars,"mpg")
# the rows for the values of the column appears once only
y <- once_only(mtcars,"mpg", return_column_only = FALSE )