Find a common edge - MATLAB Cody - MATLAB Central

Problem 45218. Find a common edge

Difficulty:
(27)
Rate
First input is T, a triplet list of indices. Second input is e = [e1 e2], a row vector, couple of indices (positive distinct integers always sorted in ascending order, ie e1 < e2 ). The goal of this function is to find and return the indices of the rows in the list which contain this particular edge. Output format can be either a column or a row vector.
For example if inputs are
T = [1 2 3 ;
1 3 4 ;
1 4 2 ;
2 3 4]
and
e = [2 3]
the output is the vector
row_idx = [1 4]
since [2 3] is contained in rows number 1 and 4 of T. With the same input T, but with e = [2 4] this time, the output is the vector row_idx = [3 4], since [2 4] is contained in rows number 3 and 4 of T (Note that edge [b a] is the same as edge [a b] so must be the corresponding outputs). If the edge is not in the list, the function must of course return the empty set.
Solve

Solution Stats

56.41% Correct | 43.59% Incorrect
Last Solution submitted on Jun 23, 2025

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers35

Suggested Problems

More from this Author22

Community Treasure Hunt

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

Start Hunting!