How to filter and sum elements of a matrix in MATLAB based on multiple conditions without a loop?

Question

I have the following numeric matrix in MATLAB: A = [3 2 7; 9 1 4; 5 6 8]; I want to sum all elements that are greater than 5 and are also even. I need to do this without using a loop, and store the result in a variable. I am looking for a correct, concise, and efficient one-liner solution that is scalable for larger matrices. The expected output for this problem is 14 (6+8).

My current attempt is: sum(A(A>5)) This code correctly filters for elements greater than 5, but it doesn't consider the "even" condition. The result I get is 34 (7+9+6+8+4), which is incorrect.

Do you know the logical AND operator (&)? That is what you need to combine the two conditions. To see if something is even you can test the remainder of the division (rem) by two. — Cris Luengo
– Cris Luengo, Commented Sep 22 at 11:46
Based on your previous (now deleted) question it feels like you're just incrementally asking a set of homework problems, you might find it insightful to read this post before asking more like this. MATLAB has really good documentation, have you tried using the free on-ramp to get started with the basics? — Wolfie
– Wolfie, Commented Sep 22 at 13:42
Thanks for the suggestion, I appreciate it. This isn't for a homework assignment, but a personal project I'm working on. However, your advice to check out the MATLAB documentation and free on-ramp is very helpful, and I will definitely do that. I just wanted to make sure my approach to combining these two conditions was correct. If you have any further guidance, that would be great. — Nar.hhs
– Nar.hhs, Commented Sep 22 at 20:28

Adriaan · Accepted Answer · 2025-09-22 11:46:42Z

3

You can include a logical search on the even/odd numbers using mod:

sum(A(A>5 & mod(A,2)==0))

answered Sep 22 at 11:46

Adriaan

18.2k7 gold badges47 silver badges88 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

How to filter and sum elements of a matrix in MATLAB based on multiple conditions without a loop?

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related