What is the correct way to get the convex hull

I have a 3D array of data which shows one concave figure. I want to find all points which don't belong to the figure, but belong to the convex hull. How can I do it?

I know I should use the convhull function, but I'm not sure how (the input is an array of size m by n, where m is the number of points and m is the number of dimensions, so 3 in my case). Also, I'm not sure how to process the output of this function - it has the same size as the input matrix.

I'd appreciate any examples.

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/101396-is-there-a-function-in-matlab-for-detecting-points-inside-a-polyhedron

http://blogs.mathworks.com/pick/2013/09/06/inpolyhedron/