How do I write double summation for a function?

Please help me to write this summation.

Thank you in advance

[Steven Lord]

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

[Payal Bhattacharjee]

A = mx;
B = my;
C = cross(A,B);
Q = 1./(4.* pi)

I am confused how to write the double summation given in the formula. Please help!

[KSSV]

It is sriaght forward.....Read about matlab indexing.