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I've got 8 points that create the outline of an eight-sided polygon in two-dimensional space. I need to find the area enclosed be these points, but how do I do that using matlab?

The eight points (x,y) are contained in the 8x2 matrix B. 

B = [ 260 455;
    1187 467;
    1325 605;
    1342 1533;
    1207 1675
    251 1690;
    107 1547;
    116 593];

The polygon is created by drawing straight lines from the point which is row 1 to row 2, then row 2 to row 3 and so on...

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3 回答 3

6

您可以使用polyarea：

ar = polyarea(B(:, 1), B(:, 2));
于 2013-03-22T21:15:14.210 回答
0

For calculating area and even volume you can use convhull.

于 2014-07-02T14:36:27.003 回答
0

我会选择梯形：

Area = trapz(B(:,1),B(:,2));
于 2013-03-22T21:44:52.663 回答