how to average a vector of arrays in Matlab

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

Answer 1

[Image Analyst]

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

Answer 2

[Steven Lord]

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