Re: heatmap.2 - centering the color ramp

Dear Hartmut,

Does breaks do what you need?

heatmap.2(mdat,Rowv=NULL,Colv="Rowv",
scale="none",col=greenred(75),key=TRUE, symkey=FALSE,
density.info="none", trace="none",dendrogram="none"
,breaks=seq(-1,1,length.out=76))

Cheers,

Artur

On Fri, May 16, 2008 at 11:51 AM, Hartmut Scheel <Hartmut@...>
wrote:

>
> Hello,
> a short question. How would one manage to have the color range centred
> around 0 instead of assigning the extreme colors (say red and green) to
> the lowest and largest value? Black should be at "0" and not at the mean
> value between the largest and the smallest value. I need to compare
> different heatmaps.
>
> Thanks for any suggestion
> Hartmut
>
> Here some simple Data:
> mdat <-
> matrix(c(1.09761079662642,0.552868871011303,0.236339539168374,-0.1568201
> 09742826,0.0908534304511135,-0.500217879852688,-0.182786075741673,-0.248
> 107861595691,-0.362157939675895),ncol=3,nrow=3,dimnames=list(c("C1","C2"
> ,"C3"),c("T1","T2","T3")))
>
>  heatmap.2(mdat,Rowv=NULL,Colv="Rowv",
> scale="none",col=greenred(75),key=TRUE, symkey=FALSE,
> density.info="none", trace="none",dendrogram="none")
>
>
>
>
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