A fn for info_snippet(): get a list of column categories

The snip_list() function can be used as an info_snippet() function (i.e., provided to fn) to get a catalog list from a table column. You can limit the of items in that list with the limit value.

Usage

snip_list(
  column,
  limit = 5,
  sorting = c("inorder", "infreq", "inseq"),
  reverse = FALSE,
  sep = ",",
  and_or = NULL,
  oxford = TRUE,
  as_code = TRUE,
  quot_str = NULL,
  na_rm = FALSE,
  lang = NULL
)

Arguments

column

The target column

scalar<character> // required

The name of the column that contains the target values.

limit

Limit for list length

scalar<integer> // default: 5

A limit of items put into the generated list. The returned text will state the remaining number of items beyond the limit.

sorting

Type of sorting within list

singl-kw:[inorder|infreq|inseq] // default: "inorder"

A keyword used to designate the type of sorting to use for the list. The three options are "inorder" (the default), "infreq", and "inseq". With "inorder", distinct items are listed in the order in which they first appear. Using "infreq" orders the items by the decreasing frequency of each item. The "inseq" option applies an alphanumeric sorting to the distinct list items.

reverse

Reversal of list order

scalar<logical> // default: FALSE

An option to reverse the ordering of list items. By default, this is FALSE but using TRUE will reverse the items before applying the limit.

sep

Separator text for list

scalar<character> // default: ","

The separator to use between list items. By default, this is a comma.

and_or

Use of 'and' or 'or' within list

scalar<character> // default: NULL (optional)

The type of conjunction to use between the final and penultimate list items (should the item length be below the limit value). If NULL (the default) is used, then the 'and' conjunction will be used. Alternatively, the following keywords can be used: "and", "or", or an empty string (for no conjunction at all).

oxford

Usage of oxford comma

scalar<logical> // default: TRUE

Whether to use an Oxford comma under certain conditions.

as_code

Treat items as code

scalar<logical> // default: TRUE

Should each list item appear in a 'code font' (i.e., as monospaced text)? By default this is TRUE. Using FALSE keeps all list items in the same font as the rest of the information report.

quot_str

Set items in double quotes

scalar<logical> // default: NULL (optional)

An option for whether list items should be set in double quotes. If NULL (the default), the quotation marks are mainly associated with list items derived from character or factor values; numbers, dates, and logical values won't have quotation marks. We can explicitly use quotations (or not) with either TRUE or FALSE here.

na_rm

Remove NA values from list

scalar<logical> // default: FALSE

An option for whether NA values should be counted as an item in the list.

lang

Reporting language

scalar<character> // default: NULL (optional)

The language to use for any joining words (from the and_or option) or additional words in the generated list string. By default, NULL will use whichever lang setting is available in the parent informant object (this is settable in the create_informant() lang argument). If specified here as an override, the language options are English ("en"), French ("fr"), German ("de"), Italian ("it"), Spanish ("es"), Portuguese ("pt"), Turkish ("tr"), Chinese ("zh"), Russian ("ru"), Polish ("pl"), Danish ("da"), Swedish ("sv"), and Dutch ("nl").

Value

A formula needed for info_snippet()'s fn argument.

Examples

Generate an informant object, add a snippet with info_snippet() and snip_list() (giving us a method to get a distinct list of column values for column f). Define a location for the snippet result in { } and then incorporate() the snippet into the info text. Note here that the order of the info_columns() and info_snippet() calls doesn't matter.

informant <-
  create_informant(
    tbl = ~ small_table,
    tbl_name = "small_table",
    label = "An example."
  ) %>%
  info_columns(
    columns = f,
    `Items` = "This column contains {values_f}."
  ) %>%
  info_snippet(
    snippet_name = "values_f",
    fn = snip_list(column = "f")
  ) %>%
  incorporate()

We can print the informant object to see the information report.

informant

Function ID

3-6

See also

Other Information Functions: info_columns(), info_columns_from_tbl(), info_section(), info_snippet(), info_tabular(), snip_highest(), snip_lowest(), snip_stats()