baptiste auguie wrote:
Hi,
A minimalist example using Grid graphics,
library(RGraphics)
bwImage <- function(m, cols=c("white", "black"),
draw=TRUE, gp=gpar()){
g <- imageGrob(nrow(m), ncol(m),
cols=cols[m+1], gp=gp)
if(draw)
grid.draw(g)
return(g)
}
m <- matrix(rnorm(200) > 0, ncol=20)
bwImage(m)
HTH,
baptiste
On 26 February 2010 09:29, Lorenzo Isella <lorenzo.ise...@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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Thanks Augustine and Jim for the prompt reply.
You both answered my question. To avoid another post, I would simply
like to know if something along these lines is doable also with ggplot2.
Many thanks
Lorenzo
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