MATLAB: How to average specific rows of all columns

averaging specific rows of all columns

i am having 100×32 matrix in my data set. i would like to average 20 rows of all columns, like first 20rows average, next 20 and so..on…

can any one help in this problem.

Best Answer

If I understand your question correctly, you can use the movmean command:

% Some made-up data
A = rand(100,32);
N = 20;
movingAverageA = movmean(A,[(N-1) 0]); % Trailing average of N rows
output = movingAverageA(N:N:end,:);

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MATLAB: How to get average of multiple rows and subtract from one group of average to another

M = your matrix with 10039 rows and 64 columns
N = 30;
whole_blocks = floor(size(M,1)/N);
leftover = size(M,1) - whole_blocks * N;
last_whole = whole_blocks * N;
whole_mean = reshape( mean(reshape(M(1:last_whole, N, [])), 2), whole_blocks, [] );
extra_mean = mean(M(last_whole+1:end, :),1);
overall_mean = [whole_mean; extra_mean];

MATLAB: How to calculate variance

A= *your matrix*
V = var(A);

If A is a matrix whose columns are random variables and whose rows are observations, V is a row vector containing the variances corresponding to each column.

Best Answer

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MATLAB: How to get average of multiple rows and subtract from one group of average to another

MATLAB: How to calculate variance

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