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How to use the inpolygon function ??

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John
John on 18 May 2013
Commented: KalMandy on 9 Nov 2016
Hi Matlab Users,
I have 4 Ponints given
X1=[0,0], X2=[2,0], X3=[2,2] and X4=[0,2]
and one point, lets say P=[1,1], that has to be tested whether it is in the convex hull of X1 to X4. How do i actually do that??
Sry, but i don´t understand the explanation for the inpolygon function when it comes to this simple example above.
I'd appreciate your help, With best regards, john

Accepted Answer

Azzi Abdelmalek
Azzi Abdelmalek on 18 May 2013
Edited: Azzi Abdelmalek on 18 May 2013
X1=[0,0], X2=[2,0], X3=[2,2],X4=[0,2]
X=[X1(1),X2(1),X3(1),X4(1)]
Y=[X1(2),X2(2),X3(2),X4(2)]
inpolygon(1,1,X,Y) % returns 1 because the point (1,1) is inside the polygon
inpolygon(10,1,X,Y)% %returns 0 because the point (10,1) is outside the polygon
  4 Comments
Steven Lord
Steven Lord on 9 Nov 2016
See the second output argument of the inpolygon function.

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