From: jim holtman <jholtman_at_gmail.com>

Date: Wed 28 Dec 2005 - 15:28:17 EST

Date: Wed 28 Dec 2005 - 15:28:17 EST

It might be hard to differentiate between each color with having 255 of them. Here is an example of using ColorRampPalette to create a set of colors. You can experiment with as many differing ones as you want to to get the difference that you want:

# use 5 colors to create a sequence (you can add more colors if you want to) f.c <- colorRampPalette(c('red','green','orange','blue','yellow'))(255) plot(0,type='n', ylim=c(0,255), xlim=c(0,1)) for (i in 1:255) segments(0, i, 1, i, col=f.c[i])

On 12/27/05, Vincent Deng <bioflash@gmail.com> wrote:

*>
**> Hi,
**>
*

> Thanks for your kindly reply.

*> 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@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@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@stat.math.ethz.ch mailing list
**> > >>>https://stat.ethz.ch/mailman/listinfo/r-help
**> > >>>PLEASE do read the posting guide!
**> http://www.R-project.org/posting-guide.html
**> > >>
**> > >>
**> >
**> >
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide!
**> http://www.R-project.org/posting-guide.html
**>
*

-- Jim Holtman Cincinnati, OH +1 513 247 0281 What the problem you are trying to solve? [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.htmlReceived on Wed Dec 28 15:35:33 2005

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