Is convhulln function work for N dimensional

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stuti chug
stuti chug 2020-9-11
编辑： Matt J 2022-10-6
I tried convhulln function on 5 dimentional data. but it shows error in qhullmx "QH6114 qhull precision error: initial simplex is not convex. Distance=-1e+02 The input to qhull appears to be less than 5 dimensional, or a computation has overflowed."
please tell me the limit of N in conhulln fuction. or is their any other function which perform as same as convhulln.
  1 个评论
Pranav Verma
Pranav Verma 2020-9-14
Hi,
Could you please provide a detailed explanation along with the code you have tried so that we can replicate the issue.
Thanks

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回答（1 个）

Matt J
Matt J 2020-9-14
编辑：Matt J 2020-9-14
The points you are inputting to convhulln do not form a solid shape in R^5. To within numerical precision, they all lie on a line or a hyper-plane or some sub-dimensional shape like that. As a remedy, you could try this FEX submission,
https://www.mathworks.com/matlabcentral/fileexchange/30892-analyze-n-dimensional-polyhedra-in-terms-of-vertices-or-in-equalities
If P are your input points, you can find the vertices V of their convex hull by doing,
[A,b,Aeq,beq]=vert2lcon(P);
V=qlcon2vert(mean(P),A,b,Aeq,beq)
  2 个评论
He Chris
He Chris 2022-10-6
Sorry, I'm stiil confued with the usage of these commands.
How can i replace 'convex = convhulln(map_x);' and obtain the variable value 'convex' with the vert2lcon and qlcon2vert ?
Thanks a lot!!
Matt J
Matt J 2022-10-6
编辑：Matt J 2022-10-6
[A,b,Aeq,beq]=vert2lcon(map_x);
convex=qlcon2vert(mean(map_x),A,b,Aeq,beq)

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