Re: [R] color vectors other than gray()

Achim Zeileis Fri, 27 Mar 2009 07:18:18 -0700

On Fri, 27 Mar 2009, Tsjerk Wassenaar wrote:

Hi,


Have a look at:

?rainbow
?rgb
?heatmap

Furthermore, the packages colorspace, ggplot, plotrix, and RColorBrewerhave useful tools for this.


For the ides behind the palettes in colorspace, see
  Achim Zeileis, Kurt Hornik, and Paul Murrell (2009).
  Escaping RGBland: Selecting Colors for Statistical Graphics.
  Computational Statistics & Data Analysis, Forthcoming.
  doi:10.1016/j.csda.2008.11.033
  Preprint: 
http://statmath.wu-wien.ac.at/~zeileis/papers/Zeileis+Hornik+Murrell-2008.pdf

hth,
Z

In my opinion this would've likely popped up with just a little effort
of searching. In fact, the help of grey() (?grey) already gives
pointers to the other color functions. Please show that you at least
have tried to find answers before posting questions on a user list.

Tsjerk

On Fri, Mar 27, 2009 at 2:16 PM, Paulo E. Cardoso <pecard...@netcabo.pt> wrote:

I'm trying to create a graph where different cells of a grid (a shapefile)
will be painted with a color share scale, where the most easy way is to use
gray().

Can I somehow get a vector (gradient) of colors, a vector of colors with
other methods but gray()?

I'm doing this until now



 quad_N_sp <-
merge(sp_dist[sp_dist$sp==splist[i],],grelha_ID,by.x="quad",by.y="quadricula
",all.y=T,)

 quad_N_sp$x[is.na(quad_N_sp$x)] <- 0

 quad_N_sp <- quad_N_sp[order(quad_N_sp$id),]

 paleta <- gray(1-(quad_N_sp$x)/max(quad_N_sp$x)) #! Tons de cinzento

 win.graph(4,5)

 plot(grelha,ol="grey80", #! Gráfico com grelha de amostragem e gradiente
de abundância

 fg=paleta,

 cex.lab=0.7,

 cex.axis=0.7,

 cex.main=0.7,

 xlab="Coord X",

 ylab="Coord Y",

 main=paste("Espécie: ",splist[i]),

 xlim=c(210000,240000)

 )

 col_lab <- c(max(quad_N_sp$x),min(quad_N_sp$x)) #! Vector com os limites
min e max do N de indivíduos observados


color.legend(248000,120000,250000,128000,col_lab,sort(unique(paleta)),gradie
nt="y",cex=0.6)#! Legenda

 text(245300,130500,"Nº Indivíduos",cex=0.6)

 plot(blocos,ol="grey40",fg=NA,add=T)



I'd like to replace the grey shade by other colors.



Thanks in advance

____________

Paulo E. Cardoso




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--
Tsjerk A. Wassenaar, Ph.D.
Junior UD (post-doc)
Biomolecular NMR, Bijvoet Center
Utrecht University
Padualaan 8
3584 CH Utrecht
The Netherlands
P: +31-30-2539931
F: +31-30-2537623

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and provide commented, minimal, self-contained, reproducible code.

______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Re: [R] color vectors other than gray()

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