MATLAB Function Reference

polyarea - Area of polygon

Syntax

A = polyarea(X,Y)
A = polyarea(X,Y,dim)

Description

A = polyarea(X,Y) returns the area of the polygon specified by the vertices in the vectors X and Y.

If X and Y are matrices of the same size, then polyarea returns the area of polygons defined by the columns X and Y.

If X and Y are multidimensional arrays, polyarea returns the area of the polygons in the first nonsingleton dimension of X and Y.

A = polyarea(X,Y,dim) operates along the dimension specified by scalar dim.

Examples

L = linspace(0,2.*pi,6); xv = cos(L)';yv = sin(L)';
xv = [xv ; xv(1)]; yv = [yv ; yv(1)];
A = polyarea(xv,yv);
plot(xv,yv); title(['Area = ' num2str(A)]); axis image

See Also

convhull, inpolygon, rectint

poly

polyder