info_columns_from_tbl function

Add column information from another data table

The info_columns_from_tbl() function is a wrapper around the info_columns() function and is useful if you wish to apply info text to columns where that information already exists in a data frame (or in some form that can readily be coaxed into a data frame). The form of the input tbl (the one that contains column metadata) has a few basic requirements:

• the data frame must have two columns
• both columns must be of class character
• the first column should contain column names and the second should contain the info text

Each column that matches across tables (i.e., the tbl and the target table of the informant) will have a new entry for the "info" property. Empty or missing info text will be pruned from tbl.

info_columns_from_tbl(x, tbl, .add = TRUE)

Arguments

• x: The pointblank informant object

  obj:<ptblank_informant> // required

  A pointblank informant object that is commonly created through the use of the create_informant() function.

• tbl: Metadata table with column information

  obj:<tbl_*> // required

  The two-column data frame which contains metadata about the target table in the informant object.

• .add: Add to existing info text

  scalar<logical> // default: TRUE

  Should new text be added to existing text? This is TRUE by default; setting to FALSE replaces any existing text for the "info" property.

Returns

A ptblank_informant object.

Examples

Create a pointblank informant object with create_informant(). We can specify a tbl with the ~ followed by a statement that gets the game_revenue dataset.

informant <- 
  create_informant(
    tbl = ~ game_revenue,
    tbl_name = "game_revenue",
    label = "An example."
  )

We can add info text to describe the data in the various columns of the table by using info_columns() or information in another table (with info_columns_from_tbl()). Here, we'll do the latter. The game_revenue_info dataset is included in pointblank and it contains metadata for game_revenue.

game_revenue_info
#> # A tibble: 11 x 2
#>    column           info                                                        
#>    <chr>            <chr>                                                       
#>  1 player_id        A `character` column with unique identifiers for each user/~
#>  2 session_id       A `character` column that contains unique identifiers for e~
#>  3 session_start    A date-time column that indicates when the session (contain~
#>  4 time             A date-time column that indicates exactly when the player p~
#>  5 item_type        A `character` column that provides the class of the item pu~
#>  6 item_name        A `character` column that provides the name of the item pur~
#>  7 item_revenue     A `numeric` column with the revenue amounts per item purcha~
#>  8 session_duration A `numeric` column that states the length of the session (i~
#>  9 start_day        A `Date` column that provides the date of first login for t~
#> 10 acquisition      A `character` column that provides the method of acquisitio~
#> 11 country          A `character` column that provides the probable country of ~

The info_columns_from_tbl() function takes a table object where the first column has the column names and the second contains the info text.

informant <-
  informant %>%
  info_columns_from_tbl(tbl = game_revenue_info)

Upon printing the informant object, we see the additions made to the 'Columns' section by the info_columns_from_tbl(tbl = game_revenue_info)

call.

informant

We can continue to add more info text to describe the columns since the process is additive. The info_columns_from_tbl() function populates the info subsection and any calls of info_columns() that also target a info

subsection will append text. Here, we'll add content for the item_revenue

and acquisition columns and view the updated report.

informant <-
  informant %>%
  info_columns(
    columns = item_revenue,
    info = "Revenue reported in USD."
  ) %>%
  info_columns(
    columns = acquisition,
    `top list` = "{top5_aq}"
  ) %>%
  info_snippet(
    snippet_name = "top5_aq",
    fn = snip_list(column = "acquisition")
  ) %>%
  incorporate()

informant

Function ID

3-3

See Also

The info_columns() function, which allows for manual entry of info text.

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