On 5/22/08, Sarah Kinnings <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I have a table with three columns of data, let's call these a, b and c. I
> have produced a scatter plot of a against b, but I would like to colour the
> points according to their corresponding c values. c takes the value of
> either 0,1,2,3 or 4 and so I would like to colour all of the points with a c
> value of 0 one colour, all those with a c value of 1 another colour etc.
> When I use the following code, it colours the points using default colours,
> which are not suitable:
>
> data<-read.table('abc',header=T, sep="\t")
> attach(data)
> library(lattice)
> xyplot(a~b, col=c)
>
> I was therefore wondering how to specify my own set of colours for each of
> the c values. Any help would really be appreciated as I have spent ages
> reading through the documentation, but with no luck.
The recommended way would be
mydata<-read.table('abc',header=T, sep="\t") # don't attach
library(lattice)
xyplot(a~b, data = mydata, groups=c)
This would use the default lattice colors (which should be different
from the ones you saw). If you don't like them, you could specify your
own colors with
mycol <- c("blue", "red", "green", "whatever")
xyplot(a~b, data = mydata, groups=c, col = mycol)
You will probably end up wanting a legend, in which case a better approach is
xyplot(a~b, data = mydata, groups=c,
par.settings = simpleTheme(col = mycol),
auto.key = TRUE)
-Deepayan
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