Conditional Formatting in Data Frames

Apply and visualize conditional formatting to data frames in R. It renders a data frame with cells formatted according to criteria defined by rules, using a tidy evaluation syntax. The table is printed either opening a web browser or within the 'RStudio' viewer if available. The conditional formatting rules allow to highlight cells matching a condition or add a gradient background to a given column. This package supports both 'HTML' and 'LaTeX' outputs in 'knitr' reports, and exporting to an 'xlsx' file.

Introduction to condformat

Sergio Oller 2026-07-09

condformat renders a data frame in which cells in columns are formatted according to several rules or criteria.

Browse source code

Checkout the code and browse it at https://github.com/zeehio/condformat.

How to install condformat:

Dependencies

If you want to use the PDF output you will need the xcolor LaTeX package. Either use the full texlive distribution, or install latex-xcolor on Debian and derivatives.

Package installation

• From CRAN:

  install.packages("condformat")
  

• To install the latest development version:

  remotes::install_github("zeehio/condformat")
  

Example

data(iris)
library(condformat)
condformat(iris[c(1:5,70:75, 120:125),]) |>
  rule_fill_discrete(Species) |>
  rule_fill_discrete(c(Sepal.Width, Sepal.Length),
                     expression = Sepal.Width > Sepal.Length - 2.25,
                     colours = c("TRUE" = "#7D00FF")) |>
  rule_fill_gradient2(Petal.Length) |>
  rule_text_bold(c(Sepal.Length, Species), Species == "versicolor") |>
  rule_text_color(Sepal.Length,
                  expression = ifelse(Species == "setosa", "yellow", "")) |>
  rule_fill_bar(Petal.Width, limits = c(0, NA)) |>
  theme_grob(rows = NULL) |>
  condformat2grob()

This example covers most of the condformat rules.

Rules and output engine support

¹ In Excel, rule_fill_bar() is rendered as a native data bar and only supports the default expression (.col); a custom expression falls back to applying just the background/na.value cell colours.