when i use inpolygon function the result is wrong but i don't konw why

[in on] = inpolygon(x,y,vx,vy); this is the commond I used in my code. vx and vy is the x and y corrdinate of boundary vertices and plot these points .

the bule point is the boundary.

 x and y is a 2d matrix and they are the x and y corrdinate of points that are needed to check if in polygon. but the answer is wrong. the answer is below:

the right answer is that points in polygon all should be choosen. But I have not find something wrong in data or code？ anybody can give me some advices？ thank you very much

[Jos (10584)]

Are your xv and yv points in the correct order? You can simply check by adding a connected line to the plot:

plot(xv,yv,'b+-')