scales::comma() のデフォルト accuracy の挙動確認

scales-comma-sandbox.md

accuracy を明示的に指定

scales::comma(c(0L, 1L), accuracy = 1)

## [1] "0" "1"

scales::comma(c(0L, 1L), accuracy = 0.1)

## [1] "0.0" "1.0"

scales::comma(c(0L, 1L), accuracy = 0.01)

## [1] "0.00" "1.00"

accuracy を指定しない

scales::comma(c(0L, 1L))

## [1] "0.0" "1.0"

scales::comma(c(0L, 9L))

## [1] "0.0" "9.0"

scales::comma(c(0L, 10L))

## [1] "0"  "10"

=> 最も近い２つの値の差が９以下の場合、accuracyが0.1以下になる。 特に、元のベクトルが整数型でも小数点が付く。

参考

https://scales.r-lib.org/reference/number_format.html

accuracy Number to round to. Use (e.g.) 0.01 to show 2 decimal places of precision. If NULL, the default, uses a heuristic that should ensure breaks have the minimum number of digits needed to show the difference between adjacent values.

Applied to rescaled data.

scales-comma-sandbox.R

#' ---
#' title: "scales::comma() のデフォルト accuracy の挙動確認"
#' author: terashim
#' output:
#'   html_document:
#'     keep_md: true
#' ---

#' ### accuracy を明示的に指定
scales::comma(c(0L, 1L), accuracy = 1)

scales::comma(c(0L, 1L), accuracy = 0.1)

scales::comma(c(0L, 1L), accuracy = 0.01)

#' ### accuracy を指定しない
scales::comma(c(0L, 1L))

scales::comma(c(0L, 9L))

scales::comma(c(0L, 10L))

#' => 最も近い２つの値の差が９以下の場合、accuracyが0.1以下になる。
#' 特に、元のベクトルが整数型でも小数点が付く。

#' ### 参考
#' 
#' https://scales.r-lib.org/reference/number_format.html
#' 
#' > accuracy	
#' > Number to round to. Use (e.g.) 0.01 to show 2 decimal places of precision. If NULL, the default, uses a heuristic that should ensure breaks have the minimum number of digits needed to show the difference between adjacent values.
#' > 
#' > Applied to rescaled data.