build_tsibble {tsibble}

Low-level constructor for a tsibble object

Description

build_tsibble() creates a tbl_ts object with more controls. It is useful for creating a tbl_ts internally inside a function, and it allows developers to determine if the time needs ordering and the interval needs calculating.

Usage

build_tsibble(
  x,
  key = NULL,
  key_data = NULL,
  index,
  index2 = index,
  ordered = NULL,
  interval = TRUE,
  validate = TRUE,
  .drop = key_drop_default(x)
)

Arguments

x

A data.frame, tbl_df, tbl_ts, or other tabular objects.

key

Variable(s) that uniquely determine time indices. NULL for empty key, and c() for multiple variables. It works with tidy selector (e.g. dplyr::starts_with()).

key_data

A data frame containing key variables and .rows. When a data frame is supplied, the argument key will be ignored.

index

A variable to specify the time index variable.

index2

A candidate of index to update the index to a new one when index_by. By default, it's identical to index.

ordered

The default of NULL arranges the key variable(s) first and then index from past to future. TRUE suggests to skip the ordering as x in the correct order. FALSE checks the ordering and may give a warning.

interval

TRUE automatically calculates the interval, and FALSE for irregular interval. Use the specified interval via new_interval() as is.

validate

TRUE suggests to verify that each key or each combination of key variables leads to unique time indices (i.e. a valid tsibble). If you are sure that it's a valid input, specify FALSE to skip the checks.

.drop

If TRUE, empty key groups are dropped.

Examples

# Prepare `pedestrian` to use a new index `Date` ----
pedestrian %>%
  build_tsibble(
    key = !!key_vars(.), index = !!index(.), index2 = Date,
    interval = interval(.)
  )