tidyr (version 0.4.1)

complete: Complete a data frame with missing combinations of data.

Description

Turns implicit missing values into explicit missing values. This is a wrapper around expand(), left_join() and replace_na that's useful for completing missing combinations of data.

Usage

complete(data, ..., fill = list())

Arguments

data

A data frame

...

Specification of columns to expand.

To find all unique combinations of x, y and z, including those not found in the data, supply each variable as a separate argument. To find only the combinations that occur in the data, use nest: expand(df

fill

A named list that for each variable supplies a single value to use instead of NA for missing combinations.

See Also

complete_ for a version that uses regular evaluation and is suitable for programming with.

Examples

library(dplyr)
df <- data_frame(
  group = c(1:2, 1),
  item_id = c(1:2, 2),
  item_name = c("a", "b", "b"),
  value1 = 1:3,
  value2 = 4:6
)
df %>% complete(group, nesting(item_id, item_name))

# You can also choose to fill in missing values
df %>% complete(group, nesting(item_id, item_name), fill = list(value1 = 0))