How can the hatched area be calculated?

1. the two curves have different x coordinates

2. when there are intersections, I want the sumation of separate areas

Answer 1

[KSSV]

Doc polyarea

[Jian Wang]

Thank you for your answer. But result is not what I want. Here is an example:

x = [0;0;2;2;1;1;0]; y = [0;1;1;2;2;0;0]; A = polyarea(x,y);

The calculated area is 0!