How to find average of every 1024th row in a vector of 61441 rows? The result should be a 60 x 1 matrix.

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Rishi 2023-5-5

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编辑： Venkat Siddarth 2023-5-5

%The Vector name is fx. I want to convert a 61441 x 1 matrix to 60 x 1 matrix such that each value in new matrix is average of 1024 rows in original matrix.

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Answer 1

chicken vector 2023-5-5

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Have a look at reshape and mean.

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Answer 2

Venkat Siddarth 2023-5-5

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编辑：Venkat Siddarth 2023-5-5

在 MATLAB Online 中打开

Hi @Rishi,

From the context,I understand that you want to convert a 61441x1 matrix to 60x1 matrix,such that each value is a mean of 1024 rows,here assuming that number of elements is 61440 but not 61441 since it is not a multiple of 1024 ,this can be solved as follows:

% create a sample 61440 x 1 matrix
fx = rand(61440, 1);
size(fx)
ans = 1×2
       61440           1
% reshape the matrix into a 1024 x 60 x 1 matrix
fx_reshape = reshape(fx, 1024, 60, []);
size(fx_reshape)
ans = 1×2
        1024          60
% take the mean of each 1024 x 60 slice along the first dimension
fx_mean = mean(fx_reshape, 1);
size(fx_mean)
ans = 1×2
     1    60
% reshape the resulting 1 x 60 x 1 matrix into a 60 x 1 matrix
fx_final = reshape(fx_mean, [], 1);
size(fx_final)
ans = 1×2
    60     1