how to average a vector of arrays in Matlab

4 views (last 30 days)
Abdullah Almohammadi
Abdullah Almohammadi on 27 Jun 2022
Answered: Steven Lord on 27 Jun 2022
Hello,
im new to matlab and I'd like to average a vector of arrays in matlab?
i have a vector of size (1,72) each column has an array of size(22,22)
i wanna avgerge the vector to get a desired output of (22,22)
i have tried this piece of code
for i= 1:72
wholeMean1{1} = mean(indexes_every.PLV.data {1,i}, 1); %% the output (1,22)
wholeMean2{1} = mean(indexes_every.PLV.data {1,i}, 2); %% the output (22,1)
wholeMean3{1} = mean(indexes_every.PLV.data {1,i}, 3); %% the output (22,22) ##
end
i just want to verfiy my result.
am i doing it correctly ?
thx in advanced

Answers (2)

Image Analyst
Image Analyst on 27 Jun 2022
One simple intuitive way is to just add up all the arrays and divide by the number of the arrays
numArrays = numel(indexes_every.PLV.data)
sumMatrix = zeros(22, 22);
for k = 1 : numArrays
sumMatrix = sumMatrix + indexes_every.PLV.data{k};
end
meanMatrix = sumMatrix / numArrays

Steven Lord
Steven Lord on 27 Jun 2022
Concatenate them in the third dimension then call mean with the dimension input.
M = magic(4)
M = 4×4
16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1
E = eye(4)
E = 4×4
1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1
N = ones(4)
N = 4×4
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
C = {M, E, N}
C = 1×3 cell array
{4×4 double} {4×4 double} {4×4 double}
A = cat(3, C{:})
A =
A(:,:,1) = 16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1 A(:,:,2) = 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 A(:,:,3) = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
mean(A, 3)
ans = 4×4
6.0000 1.0000 1.3333 4.6667 2.0000 4.3333 3.6667 3.0000 3.3333 2.6667 2.6667 4.3333 1.6667 5.0000 5.3333 1.0000

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by