Simple way using concatenation:
C = {rand(55430,2350),rand(55430,2200)}; % fake data
D = num2cell(horzcat(C{:}),2);
But I guess you are trying to avoid some "out of memory" errors, in which case loops might help:
N = numel(C);
R = size(C{1},1);
D = cell(1,R);
for ii = 1:R
T = cell(1,N);
for jj = 1:N
T{jj} = C{jj}(ii,:);
end
D{ii} = [T{:}];
end
Giving:
>> size(D)
ans =
1 55430
>> size(D{1})
ans =
1 4550
>> size(D{end})
ans =
1 4550
