Patch Between two curves that are not functions. Crosses over

I am having trouble fillling the area between {x1, y1} and {x2, y2} without it crossing over. Ideally it should be a filled Elbow shape without crossing over each other. I tried patch and fill functions and I get similair behavior.

x1 = [1 1   1  2.5  5];
y1 = [5 2.5 1  1   1];

x2 = [2 2 5];
y2 = [5 2 2];

hold on

plot(x1, y1, LineStyle=":");
plot(x2, y2, LineStyle=":");

xlim([0, 6])
ylim([0, 6])

fill([x1, x2], [y1, y2], 'k', 'FaceAlpha',0.2) 
hold off

Answer 1

[Star Strider]

Perhaps this —

x1 = [1 1   1  2.5  5];
y1 = [5 2.5 1  1   1];

x2 = [2 2 5];
y2 = [5 2 2];


figure
hold on

plot(x1, y1, LineStyle=":");
plot(x2, y2, LineStyle=":");

xlim([0, 6])
ylim([0, 6])

patch([x1 flip(x2)], [y1 flip(y2)], [1 1 1]*0.5, 'EdgeColor','none')

% fill([x1, x2], [y1, y2], 'k', 'FaceAlpha',0.2) 
hold off

The patch function fills a closed region, defined by its arguments. If you want to fill between the lines, that is relatively straightforward.

.

[Adam Watts]

Thanks! That did the trick!

[Star Strider]

As always, my pleasure!