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) |
If (X(p,q),Y(p,q)) is |
|
IN(p,q) |
If (X(p,q),Y(p,q)) is |
[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) |
If (X(p,q),Y(p,q)) is |
|
ON(p,q) |
If (X(p,q),Y(p,q)) is |
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‘)
