PURRR . TIDYVERSE . ORG {
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Title:
Functions that return data frames — map_dfr • purrr
Description:
These map(), map2(), imap(), and pmap() variants return data frames by row-binding or column-binding the outputs together. The functions were superseded in purrr 1.0.0 because their names suggest they work like _lgl(), _int(), etc which require length 1 outputs, but actually they return results of any size because the results are combined without any size checks. Additionally, they use dplyr::bind_rows() and dplyr::bind_cols() which require dplyr to be installed and have confusing semantics with edge cases. Superseded functions will not go away, but will only receive critical bug fixes. Instead, we recommend using map(), map2(), etc with list_rbind() and list_cbind(). These use vctrs::vec_rbind() and vctrs::vec_cbind() under the hood, and have names that more clearly reflect their semantics.
Website Age:
8 years and 10 months (reg. 2016-08-23).
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Keywords {🔍}
col, arg, data, null, map, trimws, exfun, names, listrbind, chr, functions, return, require, frame, purrr, frames, outputs, superseded, results, size, semantics, listcbind, usage, mapdfrx, mapdfcx, arguments, string, variable, examples, mtcars, splitmtcarscyl, mapdf, lmmpg, asdataframetasmatrixcoefmod, intercept, inputs, column, tibble, maparg, skip, content, reference, articles, news, source, rsupersededmapdfr, imap, pmap, variants, rowbinding,
Topics {✒️}
pathological inputs `map_dfr data frame modify usage map_dfr /superseded-map-df return results superseded functions require dplyr data frame row-binding column-binding edge cases _dfr variant data = df hadley wickham lionel henry site built content purrr 1 size checks confusing semantics mtcars$cyl mpg ~ wt id = null names suggest arguments data functions outputs superseded modify function column frame id map_dfr map_dfc `map_dfc col 1 col 2 col 3 col null `null` df purrr 1 size results semantics mtcars map2 ex_fun
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