gt (version 0.2.2)

fmt_scientific: Format values to scientific notation

Description

With numeric values in a gt table, we can perform formatting so that the targeted values are rendered in scientific notation. Furthermore, there is fine control with the following options:

• decimals: choice of the number of decimal places, option to drop trailing zeros, and a choice of the decimal symbol

• scaling: we can choose to scale targeted values by a multiplier value

• pattern: option to use a text pattern for decoration of the formatted values

• locale-based formatting: providing a locale ID will result in formatting specific to the chosen locale

Usage

fmt_scientific(
  data,
  columns,
  rows = NULL,
  decimals = 2,
  drop_trailing_zeros = FALSE,
  scale_by = 1,
  pattern = "{x}",
  sep_mark = ",",
  dec_mark = ".",
  locale = NULL
)

Arguments

data

A table object that is created using the gt() function.

columns

The columns to format. Can either be a series of column names provided in vars(), a vector of column indices, or a helper function focused on selections. The select helper functions are: starts_with(), ends_with(), contains(), matches(), one_of(), and everything().

rows

Optional rows to format. Not providing any value results in all rows in columns being formatted. Can either be a vector of row captions provided c(), a vector of row indices, or a helper function focused on selections. The select helper functions are: starts_with(), ends_with(), contains(), matches(), one_of(), and everything(). We can also use expressions to filter down to the rows we need (e.g., [colname_1] > 100 & [colname_2] < 50).

decimals

An option to specify the exact number of decimal places to use. The default number of decimal places is 2.

drop_trailing_zeros

A logical value that allows for removal of trailing zeros (those redundant zeros after the decimal mark).

scale_by

A value to scale the input. The default is 1.0. All numeric values will be multiplied by this value first before undergoing formatting. This value will be ignored if using any of the suffixing options (i.e., where suffixing is not set to FALSE).

pattern

A formatting pattern that allows for decoration of the formatted value. The value itself is represented by {x} and all other characters are taken to be string literals.

sep_mark

The mark to use as a separator between groups of digits (e.g., using sep_mark = "," with 1000 would result in a formatted value of 1,000).

dec_mark

The character to use as a decimal mark (e.g., using dec_mark = "," with 0.152 would result in a formatted value of 0,152).

locale

An optional locale ID that can be used for formatting the value according the locale's rules. Examples include "en_US" for English (United States) and "fr_FR" for French (France). The use of a valid locale ID will override any values provided in sep_mark and dec_mark. We can use the info_locales() function as a useful reference for all of the locales that are supported.

Value

An object of class gt_tbl.

Figures

Function ID

3-2

Details

Targeting of values is done through columns and additionally by rows (if nothing is provided for rows then entire columns are selected). A number of helper functions exist to make targeting more effective. Conditional formatting is possible by providing a conditional expression to the rows argument. See the Arguments section for more information on this.

See Also

Other Format Data: data_color(), fmt_currency(), fmt_datetime(), fmt_date(), fmt_markdown(), fmt_missing(), fmt_number(), fmt_passthrough(), fmt_percent(), fmt_time(), fmt(), text_transform()

Examples

# NOT RUN {
# Use `exibble` to create a gt table;
# format the `num` column as partially
# numeric and partially in scientific
# notation
tab_1 <-
  exibble %>%
  gt() %>%
  fmt_number(
    columns = vars(num),
    rows = num > 500,
    decimals = 1,
    scale_by = 1/1000,
    pattern = "{x}K"
  ) %>%
  fmt_scientific(
    columns = vars(num),
    rows = num <= 500,
    decimals = 1
  )

# }