how to calculate the mean using loop

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Jincy
Jincy 2023-5-25
评论： Jincy 2023-5-28
i want to calculate the mean value in 2*2 size by creating a loop
A = [1 2; 3 4]; % Matrix A
B = [2 3; 5 6]; % Matrix B
C = [A, B]; % Concatenated matrix C
meanC = 0; % Initialize mean variable
count = 0; % Initialize count variable
Iterate over the 2x2 submatrix of C
for i = 1:2
for j = 1:2
meanC = meanC + C(i, j); % Accumulate the sum
count = count + 1; % Increment the count
end
end
meanC = meanC / count; % Calculate the mean
disp(['Mean of C (2x2):', num2str(meanC)]);
when i am using this code it not giving 2*2 sized mean output
  2 个评论
Walter Roberson
Walter Roberson 2023-5-25
Your code is building a 2 x 4 matrix and totalling all of the entries in that 2 x 4 matrix.
If you are wanting a 2 x 2 output, that suggests that you want the mean of A(1,1) with B(1,1), and A(1,2) with B(1,2) and so on. Which would be just (A+B)/2 ... unless you are expected build a function that takes an indefinite number of matrix inputs.

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回答（1 个）

Sulaymon Eshkabilov
Ran in:
If I understood your question correctly, here is how it can be done:
A = [1 2; 3 4]; % Matrix A
B = [2 3; 5 6]; % Matrix B
meanC = 0; % Initialize mean variable
count = 2; % Initialize count variable
%Iterate over the 2x2 submatrix of C
for i = 1:2
for j = 1:2
meanC(i,j) = A(i, j)+B(i,j); % Accumulate the sum
end
end
meanC = meanC / count; % Calculate the mean
fprintf('Mean of C (2x2): \n')
Mean of C (2x2):
disp(reshape(meanC, 2,2));
1.5000 2.5000 4.0000 5.0000
% Validate
Cmean = (A+B)/2
Cmean = 2×2
1.5000 2.5000 4.0000 5.0000

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