new_grouped_df() is a constructor designed to be high-performance so only check types, not values. This means it is the caller's responsibility to create valid values, and hence this is for expert use only.

validate_grouped_df() validates the attributes of a grouped_df.

new_grouped_df(x, groups, ..., class = character())

validate_grouped_df(x)

Arguments

x

A data frame

groups

The grouped structure, groups should be a data frame. Its last column should be called .rows and be a list of 1 based integer vectors that all are between 1 and the number of rows of .data.

...

additional attributes

class

additional class, will be prepended to canonical classes of a grouped data frame.

Examples

# 5 bootstrap samples tbl <- new_grouped_df( tibble(x = rnorm(10)), groups = tibble(".rows" := replicate(5, sample(1:10, replace = TRUE), simplify = FALSE)) ) # mean of each bootstrap sample summarise(tbl, x = mean(x))
#> # A tibble: 5 x 1 #> x #> <dbl> #> 1 0.507 #> 2 0.464 #> 3 0.456 #> 4 0.527 #> 5 0.252