i need to plus all numbers in my Array of 3x3 then divide that number by its area using save ,for loop, function

i want to plus all my numbers in my array of 3x3 then divide it by its area using for loop function and save please

Answer 1

[fatma zahra]

% Define the 3x3 array
array = [1, 2, 3; 4, 5, 6; 7, 8, 9];

% Initialize sum variable
totalSum = 0;

% Calculate the sum of all elements using a for loop
for i = 1:3
    for j = 1:3
        totalSum = totalSum + array(i, j);
    end
end

% Calculate the area of the array (number of elements)
area = numel(array);

% Divide the sum by the area
result = totalSum / area;

% Display the result
disp(['The result is: ', num2str(result)]);

The result is: 5

[Rozh]

everything was correct but dividing part :(

[fatma zahra]

hey, I think it's correct ( 45 /9 =5) based on this example

[Rozh]

thank you soo much you saved me

Answer 2

[the cyclist]

You can sum all the elements of an array using the sum function. For example

A = magic(3)

A = 3x3

8 1 6 3 5 7 4 9 2

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S = sum(A,"all")

S = 45

You can save to file using the save function.

I don't know what you mean by the "area" of an array.

[Rozh]

for example if my array is 3x3 i divide it by 9 ...thank you

[the cyclist]

You can use numel to get the number of elements.

Answer 3

[Kunal Kandhari]

To understand how to sum elements in an array, use for loops, and perform basic arithmetic operations in MATLAB, you can refer to the following resources:

MATLAB Documentation:

• Array Indexing: This documentation explains how to access and manipulate elements in arrays. You can find it here: https://www.mathworks.com/help/matlab/math/array-indexing.html
• For Loops: Learn about the syntax and use of for loops in MATLAB. Check it out here: https://www.mathworks.com/help/matlab/ref/for.html
• Sum of Array Elements: This explains different methods to sum elements in an array. The documentation is available here: https://www.mathworks.com/help/matlab/ref/sum.html

Furthermore, you can learn the basics of MATLAB through this introductory tutorial on commonly used features and workflow:

• MATLAB Onramp: A free, self-paced introductory tutorial provided by MathWorks. It covers the basics of MATLAB, including array operations and loops. Start learning here: https://www.mathworks.com/learn/tutorials/matlab-onramp.html

[Rozh]

i just need to do that one specific thing...its a homework...i need to create an array of 3x3 and plus all and divide the number by the area like (if my array is 4x4 i divide by 16) using function and for loops

[Image Analyst]

@Rozh You should have said that it was your homework before, and tagged it as homework, which I just did for you.

I hope you haven't already turned in @fatma zahra's solution as your own or you may get in trouble for cheating. You're supposed to turn in your own work, not someone else's and claim it as your own. Some universities use plagiarism detectors to check for things like this. Good luck.

Also, @fatma zahra should not have used area as the name of the variable since it's the name of a built-in function