area

Area of polyshape

Syntax

A = area(polyin)

A = area(polyin,I)

A = area(polyin) returns the total area of a polyshape object, which is the sum of the areas of the solid regions that make up the polyshape.

A = area(polyin,I) returns the area of the Ith boundary of polyin. The area of a hole boundary is negative.

This syntax is only supported when polyin is a scalar polyshape object.

Create a polygon containing multiple solid regions and one hole, and compute its area.

P = [0 0; 0 2; 2 2; 2 0; NaN NaN; 0.5 0.5; 0.5 1.5; 1.5 1.5; 1.5 0.5; NaN NaN; 3 0.5; 3.5 1.5; 4 0.5];
polyin = polyshape(P);
plot(polyin)
axis equal

A = area(polyin)

A = 3.5000

Input polyshape, specified as a scalar, vector, matrix, or multidimensional array.

Data Types: polyshape

Boundary index, specified as a scalar integer or vector of integers. Each element of I corresponds to a single boundary of the input polyshape.