[R] Plotting a Trivial Matrix

baptiste auguie baptiste.auguie at googlemail.com
Fri Feb 26 10:12:39 CET 2010


A minimalist example using Grid graphics,


bwImage <- function(m, cols=c("white", "black"),
                    draw=TRUE, gp=gpar()){

g <- imageGrob(nrow(m), ncol(m),
               cols=cols[m+1], gp=gp)


m <- matrix(rnorm(200) > 0,  ncol=20)



On 26 February 2010 09:29, Lorenzo Isella <lorenzo.isella at gmail.com> wrote:
> Dear All,
> Consider a matrix (N x N) where each entry is either zero or one (can
> hardly get any simpler).
> Now, I would like to plot it as a 'chessboard' where every matrix entry
> is a black (1) or white (0) square.
> Whatever tool I use to plot it, it should not try to interpolate the
> data at all.
> I found some online references
> http://www.phaget4.org/R/image_matrix.html
> but probably I can resort to something much simpler.
> Can anyone provide me with a simple example I can modify later on?
> Many thanks
> Lorenzo
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.


Baptiste Auguié

Departamento de Química Física,
Universidade de Vigo,
Campus Universitario, 36310, Vigo, Spain

tel: +34 9868 18617

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