# Matrix addition of a first column in a loop

1 view (last 30 days)
Veera Kanmani on 29 Mar 2018
Edited: Guillaume on 29 Mar 2018
i have a cell A with 'n' cells inside. inside each cell i have a matrix. i want to do matrix addition of all the first column of these matrices inside a for loop. how to do it?
for i=1:n
end
KALYAN ACHARJYA on 29 Mar 2018

Guillaume on 29 Mar 2018
Edited: Guillaume on 29 Mar 2018
With a loop:
colsum = yourcellarray{1}(:, 1);
for cidx = 2:numel(yourcellarray)
colsum = colsum + yourcellarray{cidx}(:, 1);
end
With cellfun:
colsum = sum(cell2mat(@(m) m(:, 1), yourcellarray, 'UniformOutput', false)), 2);
Either way, the matrices in each cell must have the same height.
Note that if all the matrices in the same array are the same size, then storing them as an N-d array (where N = ndim(yourmatrices)+1) would make your life much easier:
allmatrices = cat(ndim(yourcellarray{1})+1, yourcellarray{:});
colsum = sum(allmatrices(:, 1), ndim(allmatrices));

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