What is the best way to fill the areas between lines in a graph?

I have to plot a the wave patterns in a nozzle and I want to highlight the changes with filling the areas between the lines with color but I can't find a way to do this.

Answer 1

[Image Analyst]

How about using patch() or fill()? Or you can use area() if you plot the top curve first and they don't overlap any.

Answer 2

[Image Analyst]

HC, I haven't heard from you so I guess you must be having trouble. Here is a demo:

curve1 = 10 + randi(2, 1, 20);
curve2 = 1 + randi(2, 1, 20);
% Find area coordinates.
inBetweenRegionX = [1:length(curve1), length(curve2):-1:1]
inBetweenRegionY = [curve1, fliplr(curve2)];
% Display the area first so it will be in the background.
fill(inBetweenRegionX, inBetweenRegionY, 'g');
hold on;
% Now plot the curves and markers on top of the area.
plot(curve1, 'rd-', 'LineWidth', 3);
plot(curve2, 'bs-', 'LineWidth', 3);
grid on;
ylim([0,13]);

If this meets your needs, please mark it as Accepted. Thanks in advance.

[Stefan]

Hello!

Would someone be so kind as to help me in my attempt to fill the area between two curves?

The x-axis must be logarithmic! Unfortunately, I don't know where my mistake lies and would be grateful for help.

Workable code is below.

Thanks and greetings

faktorOG = [1.45 1.2 1.2 1.2 1.2 1.2 1.2 1.2];

faktorUG = [0.65 0.8 0.8 0.8 0.8 0.65 0.6 0.5];

Frequenzen = [125 250 500 1000 2000 4000 5000 8000];

x = Frequenzen;

% Figure Toleranzbereich Ober- und Unter Grenze

figure

grid on

hold on

semilogx(x,faktorOG, 'k-',...

x,faktorUG, 'k:','LineWidth',1.5)

inBetweenRegionX = [1:length(faktorUG), length(faktorOG):-1:1];

inBetweenRegionY = [faktorUG, fliplr(faktorOG)];

% Display the area first so it will be in the background.

fill(inBetweenRegionX, inBetweenRegionY, 'g');

xticks([125 250 500 1000 2000 4000 10000])

xticklabels({'125','250','500','1000','2000','4000','10000'})

legend('Obergrenze','Untergrenze')

[Image Analyst]

@Stefan Fretschner you're using the wrong x. See corrected code below and it if helps, please click the "Vote" icon next to my Answer up above.

faktorOG = [1.45 1.2 1.2 1.2 1.2 1.2 1.2 1.2];
faktorUG = [0.65 0.8 0.8 0.8 0.8 0.65 0.6 0.5];
Frequenzen = [125 250 500 1000 2000 4000 5000 8000];
x = Frequenzen;
% Figure Toleranzbereich Ober- und Unter Grenze
figure
grid on
hold on
semilogx(x,faktorOG, 'k-',...
    x,faktorUG, 'k:','LineWidth',1.5)
% inBetweenRegionX = [1:length(faktorUG), length(faktorOG):-1:1];  % No - not using x.
inBetweenRegionX = [x, x(end : -1 : 1)];
inBetweenRegionY = [faktorUG, fliplr(faktorOG)];
% Display the area first so it will be in the background.
fill(inBetweenRegionX, inBetweenRegionY, 'g');
xticks([125 250 500 1000 2000 4000 10000])
xticklabels({'125','250','500','1000','2000','4000','10000'})
legend('Obergrenze','Untergrenze')

[Stefan]

Thank you for finding the bug in the code.

The first problem is solved.

Unfortunately, the x-axis is no longer logarithmic.

[Image Analyst]

@Stefan Rather than hijack @HC's question (even though your question is related), could you please start your own new question?

[Stefan]

sorry have done so.

Answer 3

[Amy Farris]

Thank you so much for this answer! It was very helpful to me!!!

[Image Analyst]

You're welcome. If it solved your problem, please mark it as Accepted. Thanks in advance.