MATLAB: Sum of all columns in a 3D cell array

3d matricescell arrayssum

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)

Best Answer

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
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