How to operate a function on matrix

Dear all, I want to operate a function on matrix elements. How to do it? See the attached file.

Answer 1

[Abdolkarim Mohammadi]

Assuming this is your homework assignment, I can only give you the clue that you can use logical indexing.

https://www.mathworks.com/help/matlab/matlab_prog/find-array-elements-that-meet-a-condition.html

[Rajkumar Verma]

This is not a homework assignment. I have already done it.

Thanks for you kind suggestions.