Create a filling between cftool prediction bounds

Hey there,

Not sure if it's even possible in Matlab, but since it's possible in other programs I'll ask :)

I have some data that I've fitted, and I've generated the code and I'm using this code to plot it:

fitresult = fit( xData, yData, ft, opts );
xFit = logspace(4,8,1000);
yFit = fitresult(xFit);
yPredict = predint(fitresult,xFit,0.683,'functional','off');

% Plot fit with data.
hold on
h = loglog(sample69_nv20_binw,sample69_nv20_bins,'rd',sample69_nv20_binw,sample69_nv20_bins,'r.',xFit,yFit,'r',xFit,yPredict,'r--');

This works well, but I would like to make the prediction area filled in light, transparent red color instead of marking the borders, similar to what you can see in the attached picture.

Is it possible? how so?

Answer 1

[Yoav Romach]

So I've found the quick way to do it and I'll add it for reference, but it's simplify calling "area" with the x and y data, much easier than patch or other methods:

fitresult = fit( xData, yData, ft, opts );
xFit = logspace(4,8,1000);
yFit = fitresult(xFit);
yPredict = predint(fitresult,xFit,0.683,'functional','off');

% Plot fit with data.
hold on
h = loglog(sample69_nv20_binw,sample69_nv20_bins,'rd',sample69_nv20_binw,sample69_nv20_bins,'r.',xFit,yFit,'r');
area(xFit,yPredict,'EdgeColor','none','FaceColor',[1 0.3 0.3]);
alpha(0.1);

Answer 2

[Dishant Arora]

You haven't attached anything, as per my guess *fill* will do the job. See this:

X = rand(1,100);
Y = rand(1,100)+1;
fill([1:100 , fliplr(1:100)] , [X , fliplr(Y)] , 'r')

[Yoav Romach]

Hey, Sorry, I've reattached it.

I haven't got fill to work, what do I need the argument to be in my case? Also, how do I make it transparent? tried alpha(0.5) but it didn't work.

[Dishant Arora]

Transparency is only observed by image, surface, and, patch objects. So, use patch instead of fill. It's arguments are vertices of the polygon you want to fill.

[Yoav Romach]

Hey, Thanks.

So I've managed to create the correct polygon using

patch([xFit;xFit],[yPredict(:,1)';yPredict(:,2)'],?)

But I'm having problem with getting the color right, it seems that no matter what I put instead of the ? it comes out black :(

I was also unable to get it transparent.

Can you help?

Thanks!