[R] colors, lines, characters .... documentation

[Don MacQueen]

Here is a little function that will show available colors in groups 
of 100 at a time.
I've only tested it in an X windows environment.

function (indx = 0:6)
{
     for (ii in unique(indx)) {
         is <- 100 * ii + 1:100
         if (min(is) > length(colors())) {
             cat("Maximum value of arg is", floor(length(colors())/100),
                 "\n")
             return(NULL)
         }
         foo <- matrix(colors()[is], nrow = 10)
         par(mar = c(3, 3, 0.25, 0.25))
         plot(1:10, 1:10, type = "n", yaxt = "n", xlab = "", ylab = "")
         axis(2, at = 1:10, lab = 10:1)
         for (j in 1:10) {
             for (i in 1:10) {
                 points(j, 11 - i, col = foo[i, j], pch = 16,
                   cex = 4)
                 text(j, 11 - i - 0.3, foo[i, j], cex = 0.8)
             }
         }
         if (length(indx) > 1 & ii < max(indx))
             readline(paste("Currently showing group", ii, "  CR to continue "))
     }
     invisible(foo)
}

-Don

At 3:05 PM +0000 3/24/04, Monica Palaseanu-Lovejoy wrote:
>Hi,
>
>Very so often when i am plotting something, doing a histogram, or
>whatever i am struggling to find out which are the numbers for
>different colors, palette names, types of lines, symbols, etc. Is
>there any documentation on line with all these numbers / names
>and the associated symbol / color???
>
>For example if i am using the command image it uses a palette
>from red to yellow, with red the lowest value, and yellow the highest
>value. What if i want a reverse palette, with green the lowest value
>and yellow middle values and red highest value??? Or much more
>simple, just yellow lowest value and red highest value???
>
>Thank you for assistance,
>
>Monica
>
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA