Filling area between lines with color

I have this figure:

And I wish to fill the area between the two straight lines with a color. I've looked around and tried fill and patch, but they don't seem to work with my straight lines? The straight lines are created by:

Line1=0.1*ones(length(signal),1);

Line2=-Line1;

Any ideas what the problem is and how to solve it?

[Yazan]

This has been answered multiple times. See here, or here.

[Sebastian Daneli]

@Yazan, already have. Does not work with my lines.

[Yazan]

clc, clear

x = 1:100;
y1 = 0.1*ones(size(x));
y2 = -y1;

plot(x, y1), hold on, plot(x, y2)
xx = [x fliplr(x)];
yy = [y1, fliplr(y2)];
fill(xx, yy, 'g', 'FaceAlpha', 0.1, 'EdgeColor', 'none')
ylim([-1, 1])

That's exactly the answer here. Why it doesn't work?

Answer 1

[Wan Ji]

If your horizontal coordinates is t array, then patch or fill can help

maxTime = max(t(:));
patch([0, maxTime, maxTime, 0], [-0.1, -0.1, 0.1, 0.1], 'r', 'facealpha', 0.3, 'edgecolor','none')

Or fill command

maxTime = max(t(:));
fill([0, maxTime, maxTime, 0], [-0.1, -0.1, 0.1, 0.1], 'r', 'facealpha', 0.3, 'edgecolor','none')

[Sebastian Daneli]

Thx, this should work.