Dear Bruce, It's doable with ggplot2, but image() is probably a better solution.
To use ggplot2, you will need to convert your array into a data.frame where each row has the information for one cell (x, y and colour) library(ggplot2) #create some dummy data dataset <- expand.grid(x = seq_len(10), y = seq_len(10)) dataset$r <- rescale(dataset$x) dataset$g <- rescale(dataset$y) dataset$b <- rescale(dataset$x - dataset$y) #create the colour information dataset$colour <- with(dataset, rgb(r, g, b)) dataset$fColour <- factor(dataset$colour) #the plot ggplot(dataset, aes(x = x, y = y, fill = fColour)) + geom_tile() + scale_fill_manual(values = levels(dataset$fColour)) Best regards, Thierry ---------------------------------------------------------------------------- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek team Biometrie & Kwaliteitszorg Gaverstraat 4 9500 Geraardsbergen Belgium Research Institute for Nature and Forest team Biometrics & Quality Assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 thierry.onkel...@inbo.be www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey > -----Oorspronkelijk bericht----- > Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] > Namens Bruce Rex > Verzonden: donderdag 28 juli 2011 20:42 > Aan: r-help@r-project.org > Onderwerp: [R] ggplot2 help/suggestions needed > > Hello, > > I have written a version of the Kohenen Self Organizing Map (in R) and wish to > use ggplot2 for the visualization. My results are RGB values in a matrix > [x,y,1:3] > where x and y comprise the first two dimensions and the third dimension is the > RGB vector. > > I am not sure whether to use geom_tile or geom_hex as there really is no > binning at the finest granularity. For testing, the matrix is 100, 100, 3 in > size. > What approach would you suggest? > > TIA, > DrX > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
