[R] plot data with a colour scale - more details!

[Jim Lemon]

Ahmed, Rayhan wrote:
> Hello again,
>
> I am trying to create a color scale plotting the hydroathy index (y-axis) versus residue (x-axis) -  each residue (1-100) has a value between 0-1. I've been trying to create a scale where:
> 0-0.499: increasing intensity of red
> 0.5- yellow
> 0.51 - 1 increasing intensity of green.
>
> THis is in lieu of a line graph.
>
> I'm not sure which type of plot to begin with - I attempted to modify a heat plot, but it did not work.
>
>   
Hi Rayhan,
I think that color2Dmatplot might do what you want. Check the last 
example that calls color.scale twice to see how to get discontinuous 
ranges of color for the values.

Jim