On 21 Dec 2004 at 11:05, michael watson (IAH-C) wrote:
> Hi > > I want to create a vector of colors that are as different from one > another as possible. ?rainbow states "Conceptually, all of these > functions actually use (parts of) a line cut out of the 3-dimensional > color space...". This suggests to me that the resulting colors are > all placed on this "line" and are equi-distant along it. The > resulting color palette is a range of colours where adjacent colours > are actually quite similar, especially when n (the number of colours) > is high. > > Conceptually I guess what I want is colors from a 3D polygon in 3D > colour space, where the number of vertices in the polygon is n, > resulting in a color palette where the colors are all quite different > from one another. Is this possible or am I talking crap? (I've only > had one coffee this morning) Hi Micheal With increased number of colors you always end with neighbour colors quite similar. If I understand the rainbow function correctly it sets saturation to 1 (maximum) value to 1 (maximum) and divide the third component hue to equally spaced intervals to get the most different colours from given range of hues. You can also experiment with hsv() function > plot(1:11, col = hsv(h = seq(0,1,.1), s=1, v=0)) #all black > plot(1:11, col = hsv(h = seq(0,1,.1), s=1, v=1)) # different colours You can imagine hue as a circle from 0 to 360 and if you want to have neighbouring colours to be the most different you have to choose them from oposit parts of a circle e.g. 0,180 or 90,270. So barvy<-rainbow(12) vyber<-c(1,7,3,9,5,11,2,8,4,10,6,12) plot(1:12,col=rainbow(12)[vyber]) will give you a sequence of 12 colours which are by my opinion most different. Cheers Petr > > Thanks in advance > Mick > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html Petr Pikal [EMAIL PROTECTED] ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
