[BioC] non-symmetric heatmap colors

[Sean Davis]

Look at using the breaks argument.  If you do breaks=seq(-3,3,0.1) and 
use 59 colors (this is important because the number of breaks and 
colors have to match--see documentation for heatmap), you get "black" 
centered on zero and red and green symmetrically set around zero (if 
using red/green colors, obviously).

Sean

On Feb 2, 2005, at 12:10 PM, <Arne.Muller at sanofi-aventis.com> wrote:

> Hello,
>
> well, it's about heatmap colors, again ... .
>
> Does anybody know a package to create a non-symmetric color map with 
> user-choosen mir point and satuaration? I've a fold-change matrix, 
> with values from -3 fold (ratio 1/3) to +7 fold. I'd like to go from 
> 0.5 (green) to 1 (black) to 3 (red).
>
> I think maPallete just assigns the lowest FC to the first color and 
> the highest FC to the last color, i.e. an evenly distributed color 
> list, right?
>
> 	Any hints are welcome,
>
> 	Arne
>
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