MATLAB: color scale with probplot

Question

I have two 1D vectors of the same length, data and my_parameter . I use probplot to see the probability plot for data, as follows:

h = probplot(gca, data);
%  in next line, want color based on my_parameter, not static color as used.
set(h, 'color', [0.5 0.5 0.5]);
set(h, 'marker', '.');

I would like to color by my_parameter , the goal being to see whether certain values of my_parameter throw off the normality of the distribution. Is there a way to use a color scale, eg, parula , in conjunction with the probplot function?

I have tried:

• Replacing the [0.5 0.5 0.5] with 'parula' .
• Replacing the [0.5 0.5 0.5] with parula .
• Replacing the [0.5 0.5 0.5] with a m-row 3-column double matrix, where each row has the rgb values that parula would map my_parameter to. (So m is the length of my_parameter .)
• Getting rid of the line set(h, 'color', [0.5 0.5 0.5]); , and adding a line colormap(parula); below the set lines.

If there is not a way to do this using the probplot function directly because of how it is written (eg if it is written to accept only 3-element vectors), I guess I'll have to try to rewrite my own version of probplot using one of the scatter functions. I could dig around and figure this out, but before I start doing this, could anyone point me to a resource where this is done already perchance?

Thanks for any help.

Answer 1

Try this:

x=rand(1,15); % dummy data to plot
probplot(x)
h = probplot(gca,x);
c = parula(10);

% this changes the color of the 'x' marks to be the first row of the parula matrix
h(1).Color = c(1,:); 

% this changes the color of the dashed line to be the 9th row of the parula matrix
h(2).Color = c(9,:)

The above produces this: