inpolygon - Points inside polygonal region
Syntax
IN = inpolygon(X,Y,xv,yv)
[IN ON] = inpolygon(X,Y,xv,yv)
Description
IN = inpolygon(X,Y,xv,yv) returns
a matrix IN the same size as X and Y.
Each element of IN is assigned the value 1 or 0 depending
on whether the point (X(p,q),Y(p,q)) is inside the polygonal
region whose vertices are specified by the vectors xv and yv.
In particular:
IN(p,q) = 1 | If (X(p,q),Y(p,q)) is inside the polygonal
region or on the polygon boundary |
IN(p,q) = 0 | If (X(p,q),Y(p,q)) is outside the polygonal
region |
[IN ON] = inpolygon(X,Y,xv,yv) returns
a second matrix ON the same size as X and Y.
Each element of ON is assigned the value 1 or 0 depending
on whether the point (X(p,q),Y(p,q)) is on the boundary
of the polygonal region whose vertices are specified by the vectors xv and yv.
In particular:
ON(p,q) = 1 | If (X(p,q),Y(p,q)) is on the polygon boundary |
ON(p,q) = 0 | If (X(p,q),Y(p,q)) is inside or outside the
polygon boundary |
Examples
L = linspace(0,2.*pi,6); xv = cos(L)';yv = sin(L)';
xv = [xv ; xv(1)]; yv = [yv ; yv(1)];
x = randn(250,1); y = randn(250,1);
in = inpolygon(x,y,xv,yv);
plot(xv,yv,x(in),y(in),'r+',x(~in),y(~in),'bo')
 | inmem | | input |  |
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