On Sat, 2009-09-05 at 04:14 -0700, FMH wrote:
> Dear All,
>
> I was looking for the color index in image function, such as from
> topo.colors(n) and etc. but still never found it. For instance, from the help
> menu.
>
>
> ###########################################
> # Volcano data visualized as matrix. Need to transpose and flip
> # matrix horizontally.
> image(t(volcano)[ncol(volcano):1,])
>
> # A prettier display of the volcano
> x <- 10*(1:nrow(volcano))
> y <- 10*(1:ncol(volcano))
> image(x, y, volcano, col = terrain.colors(100), axes = FALSE)
> contour(x, y, volcano, levels = seq(90, 200, by = 5),
> add = TRUE, col = "peru")
> axis(1, at = seq(100, 800, by = 100))
> axis(2, at = seq(100, 600, by = 100))
> box()
> title(main = "Maunga Whau Volcano", font.main = 4)
> #########################################
>
> >From the script above, it yields a beautiful image of volcano with variety
> >of colors but i have to list down the color index that could show the
> >meaning of each color in my thesis.
>
> Could someone please help me to extract this color index?
>
> Thank you
> Fir
If I understand your question you need change the Palette of image plot.
So you need use "colorRampPalette" look my example
Brazilan.Pallete <- colorRampPalette(c("green","yellow", "blue"))
image(x, y, volcano, col = Brazilan.Pallete(50), axes = FALSE)
--
Bernardo Rangel Tura, M.D,MPH,Ph.D
National Institute of Cardiology
Brazil
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