[R] Colour gradient is not working.

Boris Steipe
2015-06-01T14:59:46Z

1. Don't use Nabble for the r-help mailing list.

2. Read the posting guide, and read http://adv-r.had.co.nz/Reproducibility.html

3. The following code works for me. Your error is not due to requesting too many
colours...

n <- 100000
x <- rnorm(n)
y <- rnorm(n)
myPalette <- colorRampPalette(c("red", "blue"))
plot(x, y, pch = ".", col = myPalette(n))

... although (obviously) most of the 100,000 colour values are the same:

R > length(unique(myPalette(n)))
[1] 259



B.


On Jun 1, 2015, at 10:37 AM, David L Carlson <dcarlson at tamu.edu> wrote:

> Your example is not reproducible. You pass 33292 colors to plot, but never
specify how to use them so only the first color (red) is used. If it worked with
a smaller number of colors, you were using something other than the default plot
function. If it works with a smaller number of colors, but not more, you may
have overloaded the plot device.
>
> -------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77840-4352
>
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of sreenath
> Sent: Monday, June 1, 2015 6:12 AM
> To: r-help at r-project.org
> Subject: [R] Colour gradient is not working.
>
> I have a table of 33291 rows. When i try to plot the graph with gradient
> colour using "colorRampPalette" command but the out put graph is
colourless
> or in black colour.But when i try the same command with small values it is
> working why it so?
>
> Color <- colorRampPalette(c("red","blue"))
>
> plot(x,y,col=Color(33292))
>
>
>
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/Colour-gradient-is-not-working-tp4708000.html
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>
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>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide
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> and provide commented, minimal, self-contained, reproducible code.