With numeric values in a gt table, we can perform numberbased formatting so that the targeted values are rendered with a higher consideration for tabular presentation. Furthermore, there is finer control over numeric foramtting with the following options:
decimals: choice of the number of decimal places, option to drop trailing zeros, and a choice of the decimal symbol
negative values: choice of a negative sign or parentheses for values less than zero
digit grouping separators: options to enable/disable digit separators and provide a choice of separator 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
localebased formatting: providing a locale ID will result in number formatting specific to the chosen locale
fmt_number(data, columns, rows = NULL, decimals = 2, drop_trailing_zeros = FALSE, negative_val = "signed", use_seps = TRUE, scale_by = 1, pattern = "{x}", sep_mark = ",", dec_mark = ".", locale = NULL)
data  a table object that is created using the 

columns  the columns to format. Can either be a series of column names
provided in 
rows  optional rows to format. Not providing any value results in all
rows in 
decimals  an option to specify the exact number of decimal places to
use. The default number of decimal places is 
drop_trailing_zeros  a logical value that allows for removal of trailing zeros (those redundant zeros after the decimal mark). 
negative_val  the formatting to use for negative values. With

use_seps  an option to use digit group separators. The type of digit
group separator is set by 
scale_by  a value to scale the input. The default is 
pattern  a formatting pattern that allows for decoration of the
formatted value. The value itself is represented by 
sep_mark  the mark to use as a separator between groups of digits
(e.g., using 
dec_mark  the character to use as a decimal mark (e.g., using

locale  an optional locale ID that can be used for formatting the value
according the locale's rules. Examples include 
an object of class gt_tbl
.
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.
Other data formatting functions: data_color
,
fmt_currency
, fmt_datetime
,
fmt_date
, fmt_missing
,
fmt_passthrough
, fmt_percent
,
fmt_scientific
, fmt_time
,
fmt
, text_transform
# Use `exibble` to create a gt table; # format the `num` column as numeric # with three decimal places and with no # use of digit separators tab_1 < exibble %>% gt() %>% fmt_number( columns = vars(num), decimals = 3, use_seps = FALSE ) # Use `exibble` to create a gt table; # format the `num` column as numeric, # but treating the first four rows # different than the last four tab_2 < exibble %>% gt() %>% fmt_number( columns = vars(num), rows = 1:4, decimals = 2) %>% fmt_number( columns = vars(num), rows = 5:8, decimals = 1, scale_by = 1/1000, pattern = "{x}K")