Sum of all columns in a 3D cell array

Hello,

I have a cell array by the name phi_z = {301x51x3}

I want to take a sum of all its columns in a single slice, so it would become phi_z = {301x1x3}. I have been reading the documentation

https://uk.mathworks.com/help/matlab/ref/sum.html#mw_a0641061-edb0-4956-a9bd-949c6057ec15

but I could not find it.

after wards, I would convert the cell array to double array.

does anyone know?

phi_z = cell(301,51,3);
out=cell2mat(phi_z)
A  = sum(out,2)

[David Hill]

I am confused. What is in each cell element? Or do you just have a 301x51x3 matrix in a single cell element?

[Chris Dan]

each cell element has a value of 1, each cell element is not a matrix, it is just one value

Answer 1

[Adam Danz]

Here are the inputs according to your description

pyi_z = num2cell(rand(301,51,3));

% Check size
size(pyi_z)

ans =
   301    51     3
   
% look at first 10 values and check format   
pyi_z(1:10)

ans =
  1×10 cell array
  Columns 1 through 5
    {[0.50532]}    {[0.7123]}    {[0.72638]}    {[0.74586]}    {[0.62423]}
  Columns 6 through 10
    {[0.27062]}    {[0.80714]}    {[0.29222]}    {[0.21049]}    {[0.60563]}

Convert from cell to numeric array, compute sum of columns

% Convert to numeric array
pyi_zArray = cell2mat(pyi_z);

% Sum of columns 
t = sum(pyi_zArray,2);

% Check size of output
size(t)
ans =
   301     1     3

[Chris Dan]

thanks :)