dot-transpose: Transform a nested dataframe to / from a row by row list

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Transform a nested dataframe to / from a row by row list

Description

Data frames are column lists, which may have nested dataframes. This function transforms a data frame to row based list with named sub lists with one entry per dataframe column (a row_list). It alternative converts a row_list back to a nested data frame

Usage

.transpose(x, ..., .fix = ".")

Arguments

x	a data.frame or row_list
...	not used
.fix	collapse or expand names in redundant multi-level row_lists. Either FALSE or a string to join or split the names of the multi-level list by

Value

either a dataframe or a list of class row_list representing the dataframe as a list of named lists.

Unit tests

# create a test nested data frame:

mtcars_nest = datasets::mtcars 
  dplyr::mutate(name = rownames(.)) 
  tidyr::nest(by_carb = -c(cyl,gear,carb)) 
  tidyr::nest(by_cyl_and_gear = -c(cyl,gear))

mtcars_list = mtcars_nest 

mtcars_nest2 = mtcars_list 

testthat::expect_equal(mtcars_nest, mtcars_nest2)

rsurvstat documentation built on Feb. 20, 2026, 5:09 p.m.