Changing color of scatter point based on axis

Hi,

I am working on a scatter plot that has a temperature vector on the x-axis and an elevation vector on the y-axis. So my scatter function looks similar to scatter(temp,topo).

I would like to be able to make the points associated with the x-axis all one color (red, for example) and the points associated with my y-axis all one color(black lets say).

Here is an example of my current plot:

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Chad Greene]

This is a confusing question. All points are associated with the x and y axes, no?

To change the color of the points, include the RGB values you want as the fourth argument in scatter. The third argument corresponds to the marker size.

Below, I've created some flags. All the points in some range of x values get colored red and all the points bound by the upper right box in xy get colored blue.

x = 1:100; 
y = rand(size(x)); 

flag = NaN(size(x)); 
flag(x>10&x<50) = 1; 
flag(y>.2&x>60) = 2; 

colors = zeros(length(x),3); 
colors(flag==1,1) = 1; 
colors(flag==2,3) = 1; 

scatter(x,y,50,colors,'filled')