[R] ColorRamp different from ColorRampPalette

Etienne B. Racine etiennebr at gmail.com
Fri Apr 17 22:06:29 CEST 2009


Thanks Hadley,

Is it the solution you would recommend ?
rgb(pal.cr((0:40)/40), maxColorValue=255)

Etienne


hadley wrote:
> 
> Look at the output of pal.cr((0:40)/40)
> Hadley
> 
> On Fri, Apr 17, 2009 at 2:42 PM, Etienne B. Racine <etiennebr at gmail.com>
> wrote:
>>
>> I try to use ColorRamp as ColorRampPalette (i.e. with the same gradient),
>> but
>> it seems there is a nuance that I've missed.
>>
>> pal.crp<-colorRampPalette( c("blue", "white", "red"), space = "rgb")
>> plot(rep(0,40),pch=16,col=pal.crp(40))
>> # is great
>>
>> But, using the same gradient with colorRamp is giving erratic colors.
>>
>> pal.cr<-colorRamp( c("blue", "white", "red"), space = "rgb")
>> plot(rep(0,40),pch=16,col=pal.cr((0:40)/40))
>> # is not great
>>
>> >From the help : "colorRamp returns a function that maps values between 0
>> and
>> 1 to colors" ...colors I guess taken from the gradient, but I don't get
>> the
>> gradient.
>>
>> Etienne
>>
>> --
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>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
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>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> 
> 
> -- 
> http://had.co.nz/
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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