Problem 924. intersection of matrices

Created by Richard

Solve Later

Given two matrices filled with ones and zeros, determine if they share a common row, column entry. These matrices are of identical size.
Examples:
Inputs A = [1     0     0     0     0
            0     1     0     0     0
            0     0     1     0     0
            0     0     0     1     0
            0     0     0     0     1 ] 
   and B = [0     1     0     0     0
            0     0     1     0     0
            0     0     0     1     0
            0     0     0     0     1
            1     0     0     0     0 ]
Output tf is false
Inputs A = [1     1     1     0     1
            1     1     1     1     0
            0     1     1     1     1
            1     0     1     1     1
            1     1     0     1     1 ]
   and B = [0     1     0     0     0
            1     0     0     0     0
            0     0     0     0     1
            0     0     0     1     0
            0     0     1     0     0]
Output tf is true

Solve

Solution Stats

1822 Solutions
626 Solvers

Last Solution submitted on Oct 24, 2025

Last 200 Solutions

Problem Comments

10 Comments

10 Comments

Show 7 older comments

Marcel on 31 Dec 2013

I guess zeros are not included as common elements.

Elmar Zander on 3 Mar 2017

Yes. Seems to be a somewhat "ill-posed" problem...

Andrew Newell on 18 Apr 2017

What does "they share a common row, column entry" mean?

Nanfei Cheng on 23 Sep 2020

I think it should be a non-zero common row, column entry.

Chien-Han Su on 4 Nov 2020

Just consider the problem to be "Is there any i, j such that A(i,j) == B(i,j) == 1"

Jeong Suong Yang on 9 Nov 2020

I guess it means intersection of arrays, literally.

Kleber Zuza Nobrega on 20 Apr 2021

Do you mind do explain in a different way? it is not clear for what exactly i should do. It miss 3 problems for me, but in any of them it is not clear the problem itself.

Marco Riani on 22 Jan 2022

A small addendum to the comment of Chien-Han Su

Just consider the problem to be "Is there any i, j such that A(i,j) == B(i,j) and A(i,j) or B(i,j) ~=0"

Jung Un Park on 5 Jul 2023

Problem description is poor.

Olayinka on 11 Nov 2023

Please explain this problem for further clarity

Solution Comments

Show comments

Problem Recent Solvers626

Problem Tags

Community Treasure Hunt

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

Start Hunting!