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List:       r-sig-gr
Subject:    [R--gR] color index in image function
From:       FMH <kagba2006 () yahoo ! com>
Date:       2009-09-03 17:28:26
Message-ID: 757992.88367.qm () web38306 ! mail ! mud ! yahoo ! com
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Dear All,

I was looking for the color index in image function, such as from topo.colors 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




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