# Find the average of a column without the use of commands.

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Cappi Nguyen el 15 de Mayo de 2023
Editada: Sai el 18 de Mayo de 2023
I have a matrix that is [365,4] and I need to find the average of each column without the use of commands like mean or size. With the use of a for loop.
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Cappi Nguyen el 15 de Mayo de 2023
Nevermind I am sorry, I realize I could use the size command for this code. But I don't have any errors in the code just needed some help with it.
dpb el 15 de Mayo de 2023
Beware! length is a dangerous command/function that may not return what you intend -- it is defined as max(size(x)) and so returns either the number of elements in a row or column of any 2D array -- which would depend upon the array configuration. The 4x3 or 3x4 array will both return 4...

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Sai el 18 de Mayo de 2023
Editada: Sai el 18 de Mayo de 2023
Hi Cappi,
I understand that you wanted to calculate the average of columns of a matrix without the usage of in-built commands.
Please find the following code snippet to do the same.
A = [1 2 3;4 5 6;7 8 9;10 11 12] %Consider the matrix for reference
A = 4×3
1 2 3 4 5 6 7 8 9 10 11 12
nRows = height(A);
nColumns = width(A);
avg = zeros(1,nColumns);
for i = 1:width(A)
C = A(:,i);
sum = 0;
for j = 1:nRows
sum = sum + C(j);
end
avg(i) = sum/nRows;
end
disp(avg)
5.5000 6.5000 7.5000
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