Problem 45256. List one vertex neighbors

First input T is a triangulation connectivity indices list (triplet list of indices -positive integers-, each index refering to a vertex number in a corresponding vertices list).

Second input i is a vertex index (positive integer).

The purpose of this function is to query the list L of all i neighbor indices.

For instance if

T = [1 2 4;...
     2 3 4;...
     5 6 8;...
     6 7 8;...
     1 2 5;...
     2 5 6;...
     2 3 6;...
     3 6 7;...
     3 4 7;...
     4 7 8;...
     4 1 8;...
     1 8 5]

and i = 3, then the function should return

L = [2, 4, 6, 7]

since 2, 4, 6, and 7 are all part of triangles / rows in which 3 is also a vertex member.

Hypothesis :

- Output L doesn't need to be ordered, but must not contain duplicated index.

- Output L is a row vector , and if the vertex index is not in the list , the function must of course return the empty set, [].

Solution Stats

83.33% Correct | 16.67% Incorrect
Last Solution submitted on Feb 06, 2024

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers14

Suggested Problems

More from this Author9

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!