# [R] How to plot curves with more than 8 colors

Vincent Deng bioflash at gmail.com
Wed Dec 28 03:48:24 CET 2005

Hi,

I think maybe I didn't specify color codes properly. That is,the
difference between each color is not sharp enough for me to identify
them as different colors.

So can you tell me about how to specify the color properly so that the
difference among each color can be identified clearly?

Thanks again and again ...

On 12/27/05, Uwe Ligges <ligges at statistik.uni-dortmund.de> wrote:
> Vincent Deng wrote:
>
> > Dear Uwe,
> >
> > Sorry, I did not describe my question clearly. I created a matrix to
> > store color code using rgb function.
> >
> > abc = rgb(6:36,0,0,maxColorValue = 255)
> >
> > And after running codes like this
> >
> > for (i in c(1:20))
> > {
> >    points(...,...,col=abc[i])
> >    lines(...,col=abc[i])
> > }
> >
> > R still used 8 colors of abc color codes repeatedly to draw the diagram
> >
> > Any helps?
>
>
> No, it does not (in fact, all appears to be more or less black on my
> screen ;-)). Another example:
>
> plot(1:255, col=rgb(1:255,0,0,maxColorValue = 255))
>
> Uwe Ligges
>
>
>
> > Best Regards...
> >
> > On 12/27/05, Uwe Ligges <ligges at statistik.uni-dortmund.de> wrote:
> >
> >>Vincent Deng wrote:
> >>
> >>>Hi,
> >>>
> >>>I'm a new hand in R language. I have about 20 groups of data[x,y] and
> >>>want to plot them on a graph. To do this, I write a for-loop as
> >>>following: (some codes are omitted for simplicity)
> >>>
> >>>for (i in c(1:20))
> >>>{
> >>>  points(...,...,col=i)
> >>>  lines(...,col=i)
> >>>}
> >>>
> >>>The problem is "R only plot them with 8 colors repeatly". Could anyone
> >>>help me solve this problem? Or is there any package providing plot
> >>>function without color limit?
> >>
> >>
> >>After typing
> >>
> >>  ?colors
> >>
> >>I get a nice help page that points me to a lot of other functions that
> >>generate more than 8 colors. Maybe your installation of R is broken and
> >>you cannot see this help page? You certainly tried to get help on colors
> >>as well.
> >>
> >>There is no limit of the color number in the functions above, simply
> >>specify the color you want to get. The only color limit applies for the
> >>device and for most devices and rgb colors this is 256^3.
> >>
> >>Uwe Ligges
> >>
> >>
> >>
> >>
> >>
> >>>Best Regards...
> >>>
> >>>______________________________________________
> >>>R-help at stat.math.ethz.ch mailing list
> >>>https://stat.ethz.ch/mailman/listinfo/r-help