R help - Jan 2009 - plot data with a colour scale - more details!

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.

Any assistance would be greatly appreciated.

Thanks again, and sincerest apologies for the inconvenience.

-ray

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

Hi Jim,

This is clearly the function I need to use. However, I am new to Rplot
and coding.  I know that my output image is not what the data
indicate. My input file is a matrix, where the first row is the
residue number (10 values), and the second row is the hydrophathy
values (10 corresponding values ranging from 0.3-0.9).

At this point, the discontinous shading would be a polishing step, and
I would be just content with the color scale corresponding to the
range of hydropahty values.

Thanks.

-Ray



On Mon, Jan 19, 2009 at 8:55 AM, Ahmed, Rayhan <raahmed at utmb.edu>
wrote:
>
>
> ________________________________________
> From: Jim Lemon [jim at bitwrit.com.au]
> Sent: Saturday, January 17, 2009 5:58 PM
> To: Ahmed, Rayhan
> Cc: r-help at r-project.org
> Subject: Re: [R] plot data with a colour scale - more details!
>
> 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