fill area between two curves

Hello,

I have two PSD graphs and I want to fill the area between them.

I used this code but it didn't work properly:

figure(3)
x2 = [f2(321:1921,:), fliplr(f2(321:1921,:))];
inBetween = [yconf(321:1921,1), fliplr(yconf(321:1921,2))];
fill(x2, inBetween, 'g');

Does anyone know how I can fix it?

Thanks,

Amir

Answer 1

[Voss]

You should use flipud() or flip(_,1) or just use indexing (and do vertical concatenation with ; rather than horizontal concatenation with ,):

% some data similar to yours for the purpose of filling between:
f2 = linspace(0,30,64*30+1).';
yconf = -40*sin(f2)-40+[0 -20];
plot(f2,yconf);
xlim([5 30]);

% fill using flip():
figure()
x2 = [f2(321:1921,:); flip(f2(321:1921,:),1)];
inBetween = [yconf(321:1921,1); flip(yconf(321:1921,2),1)];
fill(x2, inBetween, 'g');
xlim([5 30]);

% fill using indexing:
figure()
x2 = f2([321:1921 1921:-1:321],:);
inBetween = [yconf(321:1921,1); yconf(1921:-1:321,2)];
fill(x2, inBetween, 'g');
xlim([5 30]);

[Amir Hosein Shokouhy]

Awesome, thanks. Is there anyway I could remove the black line borders?

[Voss]

You're welcome!

Specify 'EdgeColor','none' in the call to fill() to draw no border around the patch object. Here it is on top of the lines it is based on:

% some data similar to yours for the purpose of filling between:
f2 = linspace(0,30,64*30+1).';
yconf = -40*sin(f2)-40+[0 -20];
plot(f2,yconf);
xlim([5 30]);
hold on
% fill using indexing:
x2 = f2([321:1921 1921:-1:321],:);
inBetween = [yconf(321:1921,1); yconf(1921:-1:321,2)];
fill(x2, inBetween, 'g', 'EdgeColor','none');
xlim([5 30]);

[Amir Hosein Shokouhy]

Thank you very much!

[Voss]

You're welcome!

Answer 2

[Davide Masiello]

I think the problem might be that your y-values are column vectors, and therefore you create a matrix when you concatenate them using the comma.

Maybe this will work

figure(3)
x2 = [f2(321:1921,:), fliplr(f2(321:1921,:))];
inBetween = [yconf(321:1921,1)', fliplr(yconf(321:1921,2))'];
fill(x2, inBetween, 'g');