Compute the summation of all elements square of matrix

[James Tursa]

What have you done so far? What specific problems are you having with your code?

[Asad (Mehrzad) Khoddam]

you can use either

sum(a(:))

or

sum(sum(a))

[the cyclist]

In recent versions of MATLAB, one can also do

sum(a,'all')

Answer 1

[Asad (Mehrzad) Khoddam]

% simply use
sum(a(:))

Answer 2

[the cyclist]

This looks like homework.

In the future, please listen to James Tursa's advice, and post what you have tried, be specific about what you want to know, and don't simply post an image of your homework. That is simply not the way to learn, which I assume is your goal.

That being said, and since others have posted solutions, I'll point out that there is some poor English in that question, that makes it ambiguous. It says, "the summation of all the elements' square".

This could reasonably be taken to mean any of the following:

• the matrix is a square, so just sum all the elements
• square the matrix (i.e. A*A), then sum the elements
• square each element individually, then take the sum of all of them

My best guess is the assignment is trying to get you to do the last one. Maybe with the other comments/answers here, you can figure it out.