[R] 2d plotting and colours

Uwe Ligges
Wed, 30 Mar 2005 07:18:04 -0000

TEMPL Matthias wrote:

> Hi!
>
> There are more than 8 colors.

Yes, e.g. for rgb space there are 16777216, see ?rgb.

Uwe Ligges



> x <- rbind(matrix(rnorm(100, sd = 0.3), ncol = 2),
>                 matrix(rnorm(100, mean = 1, sd = 0.3), ncol = 2))
>
> (cl <- kmeans(x, i, 20))
>
> s <- c("tomato4", "turquoise",
"slateblue", "wheat", "snow", "skyblue",
> "peru", "pink")
> # see at:
> colors()
>
> plot(x, col = s)
>
> points(cl$centers, col = s, pch = 8, cex=2)
>
>
> Best,
> Matthias
>
>
>
>
>
>>Hi!
>>
>>I am new to R just 3 days in it and i apologize if my
>>questions seem very
>>trivial and consumed your valuable time.
>>
>>I am coding in perl and i stumbled upon R regarding plotting good
>>statistical graphs.
>>
>>I tried the kmean clustering for a large matrix ,say > 150 *
>>150 . I tried
>>the example code given in the tutorial to perform 2d plot
>>
>># i ranges from 2 to 10
>>cl <- kmeans(x, i, 20)
>>plot(x, col = cl$cluster)
>>points(cl$centers, col = 1:i )
>>
>>I see that there are only 8 colours defined , namely
>>black,red,green,blue,cyan,magenta,yello,gray.
>>
>>How should i set my colour preferences to obtain my palette
>>of colours? I
>>checked in the totorial which talks about R.colors and
>>palatte , but i
>>failed to understand how to set it.
>>
>>Thank You
>>
>>Asha
>>
>>
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>
>
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