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With numeric values in a vector, we can transform those to numbers that are spelled out. Any values from 0 to 100 can be spelled out according to the specified locale. For example, the value 23 will be rendered as "twenty-three" if the locale is an English-language one (or, not provided at all); should a Swedish locale be provided (e.g., "sv"), the output will instead be "tjugotre".


  pattern = "{x}",
  locale = NULL,
  output = c("auto", "plain", "html", "latex", "rtf", "word")



The input vector

vector(numeric|integer) // required

This is the input vector that will undergo transformation to a character vector of the same length. Values within the vector will be formatted.


Specification of the formatting pattern

scalar<character> // default: "{x}"

A formatting pattern that allows for decoration of the formatted value. The formatted value is represented by the {x} (which can be used multiple times, if needed) and all other characters will be interpreted as string literals.


Locale identifier

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

An optional locale identifier that can be used for formatting values according the locale's rules. Examples include "en" for English (United States) and "fr" for French (France). We can call info_locales() for a useful reference for all of the locales that are supported.


Output format

singl-kw:[auto|plain|html|latex|rtf|word] // default: "auto"

The output style of the resulting character vector. This can either be "auto" (the default), "plain", "html", "latex", "rtf", or "word". In knitr rendering (i.e., Quarto or R Markdown), the "auto" option will choose the correct output value


A character vector.

Supported locales

The following 80 locales are supported in the locale argument of vec_fmt_spelled_num(): "af" (Afrikaans), "ak" (Akan), "am" (Amharic), "ar" (Arabic), "az" (Azerbaijani), "be" (Belarusian), "bg" (Bulgarian), "bs" (Bosnian), "ca" (Catalan), "ccp" (Chakma), "chr" (Cherokee), "cs" (Czech), "cy" (Welsh), "da" (Danish), "de" (German), "de-CH" (German (Switzerland)), "ee" (Ewe), "el" (Greek), "en" (English), "eo" (Esperanto), "es" (Spanish), "et" (Estonian), "fa" (Persian), "ff" (Fulah), "fi" (Finnish), "fil" (Filipino), "fo" (Faroese), "fr" (French), "fr-BE" (French (Belgium)), "fr-CH" (French (Switzerland)), "ga" (Irish), "he" (Hebrew), "hi" (Hindi), "hr" (Croatian), "hu" (Hungarian), "hy" (Armenian), "id" (Indonesian), "is" (Icelandic), "it" (Italian), "ja" (Japanese), "ka" (Georgian), "kk" (Kazakh), "kl" (Kalaallisut), "km" (Khmer), "ko" (Korean), "ky" (Kyrgyz), "lb" (Luxembourgish), "lo" (Lao), "lrc" (Northern Luri), "lt" (Lithuanian), "lv" (Latvian), "mk" (Macedonian), "ms" (Malay), "mt" (Maltese), "my" (Burmese), "ne" (Nepali), "nl" (Dutch), "nn" (Norwegian Nynorsk), "no" (Norwegian), "pl" (Polish), "pt" (Portuguese), "qu" (Quechua), "ro" (Romanian), "ru" (Russian), "se" (Northern Sami), "sk" (Slovak), "sl" (Slovenian), "sq" (Albanian), "sr" (Serbian), "sr-Latn" (Serbian (Latin)), "su" (Sundanese), "sv" (Swedish), "sw" (Swahili), "ta" (Tamil), "th" (Thai), "tr" (Turkish), "uk" (Ukrainian), "vi" (Vietnamese), "yue" (Cantonese), and "zh" (Chinese).


Let's create a numeric vector for the next few examples:

num_vals <- c(1, 8, 23, 76, 0, -5, 200, NA)

Using vec_fmt_spelled_num() will create a character vector with values rendered as spelled-out numbers. Any NA values remain as NA values. The rendering context will be autodetected unless specified in the output argument (here, it is of the "plain" output type).

#> [1] "one"     "eight"     "twenty-three"  "seventy-six"  "zero"
#> [6] "-5"      "200"       "NA"

If we are formatting for a different locale, we could supply the locale ID and let gt obtain a locale-specific set of spelled numbers:

vec_fmt_spelled_num(num_vals, locale = "af")

#> [1] "een"     "agt"     "drie-en-twintig"     "ses-en-sewentig"
#> [5] "nul"     "-5"      "200"                 "NA"

As a last example, one can wrap the values in a pattern with the pattern argument. Note here that NA values won't have the pattern applied.

vec_fmt_spelled_num(num_vals, pattern = "{x}.")

#> [1] "one."     "eight."     "twenty-three."  "seventy-six."  "zero."
#> [6] "-5."      "200."       "NA"

Function ID


Function Introduced

v0.9.0 (Mar 31, 2023)