Collapse a list of dataframes, or merge two dataframes together

This function is essentially a wrapper for any of dplyr's mutate-joins (by default, a full_join). The most typical use of this function is to merge designs with measures data, or to use the collapse functionality to merge a list of dataframes into a single dataframe. Merging is done by column names that match between x and y.

Usage

merge_dfs(
  x,
  y = NULL,
  by = NULL,
  drop = FALSE,
  collapse = FALSE,
  names_to = NA,
  join = "full",
  warn_morerows = TRUE,
  ...
)

Arguments

x

First data.frame, or list of data frames, to be joined

y

Second data.frame, or list of data frames, to be joined

by

A character vector of variables to join by, passed directly to the join function

drop

Should only complete_cases of the resulting data.frame be returned?

collapse

A logical indicating whether x or y is a list containing data frames that should be merged together before being merged with the other

names_to

Column name for where names(x) or names(y) will be entered in if collapse = TRUE.

If a value of NA then names(x) or names(y) will not be put into a column in the returned data.frame

join

Type of join used to merge x and y. Options are 'full' (default), 'inner', 'left', and 'right'.

• A full join keeps all observations in x and y

• A left join keeps all observations in x

• A right join keeps all observations in y

• An inner join only keeps observations found in both x and y (inner joins are not appropriate in most cases because observations are frequently dropped).

See full_join, left_join, right_join, or inner_join for more details

warn_morerows

logical, should a warning be passed when the output has more rows than x and more rows than y?

...

Other arguments to pass to the underlying join function. See full_join, left_join, right_join, or inner_join for options.

Value

Data.frame containing merged output of x and y