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

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Cappi Nguyen 2023-5-15

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https://ww2.mathworks.cn/matlabcentral/answers/1963544-find-the-average-of-a-column-without-the-use-of-commands

编辑： Sai 2023-5-18

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 2023-5-15

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 2023-5-15

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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回答（1 个）

Sai 2023-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/1963544-find-the-average-of-a-column-without-the-use-of-commands#answer_1238659

编辑：Sai 2023-5-18

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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