kableExtra how to use cell_spec from a user defined range? - r

Question

First, the package kableExtra indeed produces awesome table. I just have an additional request :
When running this example ( from the manual)
iris[1:10, ] %>% select(-Species) %>%
mutate_if(is.numeric, function(x) {
cell_spec(x, "latex", bold = T, color = spec_color(x, end = 0.9),
font_size = spec_font_size(x))
}) %>%
kable("latex", escape = F, booktabs = T, linesep = "", align = "c")
The cells are formated in each column. (1) How to adjust them to the entire table ? (2) Or to a user defined scale ? I noticed that both kableExtra::spec_color and
kableExtra::cell_spec make use of the scales::rescale function which does take a from argument but it's not used in the functions.
Below code of reproducible .Rnw script.
\documentclass{article}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage{booktabs}
\usepackage{float}
\usepackage{colortbl}
\begin{document}
<<tab10, echo=FALSE, results="as.is">>=
require(knitr)
require(kableExtra)
require(tidyverse)
#
<<tab1, echo=FALSE, results="as.is">>=
require(knitr)
require(kableExtra)
require(tidyverse)
iris[1:10, ] %>% select(-Species) %>%
mutate_if(is.numeric, function(x) {
cell_spec(x, "latex", bold = T, color = spec_color(x, end = 0.9),
font_size = spec_font_size(x))
}) %>%
kable("latex", escape = F, booktabs = T, linesep = "", align = "c")
#
\end{document}

Answer 1

Okay, with the latest dev ver, you can use scale_from in spec_color, spec_font_size & spec_angle.
library(kableExtra)
library(dplyr)
library(knitr)
iris[1:10, ] %>%
select(-Species) %>%
mutate_if(is.numeric, function(x) {
cell_spec(x, "latex", bold = T,
color = spec_color(x, end = 0.9, scale_from = range(unlist(iris[1:10, ]))),
font_size = spec_font_size(x, scale_from = range(unlist(iris[1:10, ]))))
}) %>%
kable("latex", escape = F, booktabs = T, linesep = "", align = "c")