plot matrix of characters

It's a bit of a hack-job, but this might get you started:

d <- structure(c("A", "A", "A", "B", "A", "A", "C", "C", "A", "D",
"C", "C"), .Dim = 3:4)

plot(0, type = "n", xlim = c(0,ncol(d)), ylim = c(0, nrow(d)), xaxt = "n",
? ? yaxt ="n",xlab = NA,ylab = NA)

ytop <- (nrow(d) - row(d)) + 1
ybottom <- (nrow(d) - row(d))

xleft <- col(d)-1
xright <- col(d)

cols <- rainbow(length(unique(c(d))))

rect(xleft = xleft, xright = xright, ytop = ytop, ybottom = ybottom,
? ? col = cols[as.integer(factor(d))])
text(xleft + 1/2, ybottom + 1/2, labels = d, col = "white")


Some hints for a new poster:
i) Always cc the list: it gives you opportunities for your questions
to be seen by a much wider audience which will get you quicker and
better answers.
ii) Use dput() to make plain-text representations of your data for
easy emailing (like how i set up d above)

Best,

Michael

On Wed, Dec 14, 2011 at 11:53 AM, Ana <rrasterr at gmail.com> wrote:

What I would like to do is to plot the matrix A:

"A" "B" "C" "D"
"A" "A" "C" "C"
"A" "A" "A" "C"

into a image e.g. ?with the following colours

"Yellow" "Blue" "Green" "Black"
"Yellow" "Yellow" "Green" "Green"
"Yellow" "Yellow" "Yellow" "Green"


I have no idea on how to do it, until now I've been only working with
numeric and dates plots.




On Wed, Dec 14, 2011 at 5:35 PM, R. Michael Weylandt
<michael.weylandt at gmail.com> wrote:

I may be confused, but this seems ill-defined since, in the example,
the color corresponds to a numerical value: characters are only there
as labels. Do you intend to map the characters onto some numerical
spectrum? If so, how?

As a side note, one of the best places to get visualization ideas in
my experience has been the R Graph Gallery. It's often worth a look
and comes with code examples for all the entries: perhaps you can find
some attempts at "graphing" character data there.

Michael

On Wed, Dec 14, 2011 at 11:30 AM, Ana <rrasterr at gmail.com> wrote:

Hi, I am looking for options to plot the following type of matrices:

"A" "B" "C" "D"
"A" "A" "C" "C"
"A" "A" "A" "C"

as a image like this: http://www.phaget4.org/R/image002.jpg