I want to create latex tables of values where the cell background is
shaded according to the
table value. For example:
set.seed(1) # reproducibility
mat <- matrix(3 * rnorm(12), 3, 4)
rownames(mat) <- letters[1:3]
colnames(mat) <- LETTERS[1:4]
> round(mat,1)
A B C D
a -1.9 4.8 1.5 -0.9
b 0.6 1.0 2.2 4.5
c -2.5 -2.5 1.7 1.2
# colors to use: blue(+), red(-) with two shading levels,
# depending on abs(x) > 2
cols <- c(rgb(0.85,0.85,1),
rgb(0.7 ,0.7 ,1),
rgb(1,0.85,0.85),
rgb(1,0.7 ,0.7 ))
cols <- matrix(cols, 2,2)
cellcol <- apply(mat, 1:2,
function(x) {i<-1+(x>0); j<-1+(abs(x)>2); cols[i,j]})
>
> cellcol
A B C D
a "#D9D9FF" "#FFB2B2" "#B2B2FF" "#D9D9FF"
b "#B2B2FF" "#B2B2FF" "#FFB2B2" "#FFB2B2"
c "#FFD9D9" "#FFD9D9" "#B2B2FF" "#B2B2FF"
What I want is to generate a latex table of mat, with each cell colored
according to cellcol.
I can do this manually as shown below, using the latex colortbl package
and a macro
\cell{value}{color}. How can I produce this in R?
# colortab-test.tex -----------------------
%% Latex part:
\documentclass[11pt]{article}
\usepackage{xcolor,colortbl}
# wrap each cell with command to define background color
\newcommand{\cell}[2]{\multicolumn{1}%
{>{\columncolor{#1}}r}{#2}}
\definecolor{blueA}{rgb}{0.85,0.85,1}
\definecolor{blueB}{rgb}{0.7 ,0.7 ,1}
\definecolor{redA}{rgb}{1,0.85,0.85}
\definecolor{redB}{rgb}{1,0.7 ,0.7 }
\begin{document}
\begin{tabular}{lcccc}
& A & B & C & D \\
a & \cell{-1.9}{redB} & \cell{4.8}{blueA} & \cell{1.5}{blueB} &
\cell{-0.9}{redB} \\
b & \cell{0.6}{blueB} & \cell{1.0}{blueB} & \cell{2.2}{blueA} &
\cell{4.5}{blueA} \\
c \cell{-2.5}{redA} & \cell{-2.5}{redB} & \cell{1.7}{blueB} &
\cell{1.2}{blueB} \\
\end{tabular}
\end{document}
# --------------------------------------------
--
Michael Friendly Email: friendly AT yorku DOT ca
Professor, Psychology Dept. & Chair, Quantitative Methods
York University Voice: 416 736-2100 x66249 Fax: 416 736-5814
4700 Keele Street Web: http://www.datavis.ca
Toronto, ONT M3J 1P3 CANADA
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