Scale background color on tabularray, confusion matrix?

Question

I'm using tabularray to create my confusion matrix but I've been unable to automatically changing the background color of it, like many examples out there:

Here is my minimal working example:

\documentclass{article}
\usepackage{color}
\usepackage{tabularray}
\usepackage{graphicx}
\begin{document}
\begin{table}
\centering
\resizebox{\linewidth}{!}{%
\begin{tblr}{
  cell{1}{3} = {c=3}{},
  cell{3}{1} = {r=3}{},
}
       &         & Predicted &         &         \
       &         & Class A   & Class B & Class C \
Actual & Class A & 1.00      &         & 0.10    \
       & Class B & 0.10      & 0.80    & 0.10    \
       & Class C & 0.30      &         & 0.70

\end{tblr}
}
\end{table}
\end{document}

I've been unsuccessful in applying a formula to a range, such as:

cell{3-5}{3-5} = {cmd=\formula_to_automatically_scale_color} Or directly applying it to a cell: \formula_to_automatically_scale_color{} nothing seems to work.

I would greatly appreciate your help

muzimuzhi Z · Accepted Answer · 2023-11-23T03:52:50.323

Just a starting point.

\documentclass{article}
\usepackage{tabularray}
\usepackage{xcolor}
\ExplSyntaxOn
\cs_new_protected:Npn \mysetcellcolor #1
  {
    \bool_lazy_and:nnT
      { \lTblrMeasuringBool }
      { ! \tl_if_empty_p:n {#1} }
      {
        % When cmd code is used, table commands like \SetCell are already
        % restored to definitions outside of tblr env (i.e., using \SetCell in
        % cmd code has no effect), a tabularray internal is used.
        % see https://github.com/lvjr/tabularray/blob/e5f340b1f8a60b7b24acdf02991cf0a29811426a/tabularray.sty#L1804
        __tblr_cell_gput:ne { background } {blue!\fp_to_tl:n{#1*100}!green}
      }
    #1
  }
\ExplSyntaxOff
\begin{document}
\begin{tblr}{
  cell{1}{3} = {c=3}{},
  cell{3}{1} = {r=3}{},
  cell{3-5}{3-5} = {cmd=\mysetcellcolor}
}
       &         & Predicted &         &         \
       &         & Class A   & Class B & Class C \
Actual & Class A & 1.00      &         & 0.10    \
       & Class B & 0.10      & 0.80    & 0.10    \
       & Class C & 0.30      &         & 0.70

\end{tblr}
\end{document}

Scale background color on tabularray, confusion matrix?

1 Answers1