group_by {m61r}

group_by a data.frame by chosen columns

Description

Group a data.frame by chosen columns

Usage

group_by_(df, group = NULL)

Arguments

df

data.frame

group

formula that describes the group

Value

The function returns a list. Each element of the list is a subset of data frame df. Subset is determined by variables given in group. Each data frame get the following properties:

• Columns are not modified.

• Only rows corresponding to the subset.

• Data frame attributes are preserved.

Examples

tmp <- group_by_(CO2,~c(Type,Treatment))

tmp[[1]]