How to update multi-level cell array in a Parfor loop

 A=cell(length(10),length(1920));
 parfor i=1:length(10)

    temp=cell(1,length(1920));

    for j=1:length(1920)
        temp{j}=data{i}(data{i}(:,1)==dateIndex(j),2);
    end

    A{i,:}=temp;

 end

I have this code in my program. I have A which is a 10 by 1920 cell array. and the loop inside will generate a variable 'temp' which will be 1 by 1920 multi-level cell array. looks like this

I want use make the A to be a 10 by 1920 first, and then aggregate all values (keep all values) in those 10 rows into one row, to be a 1by1920 cell array.

but i only managed to do A as follow:

Is there any suggestions and How can i aggregate 10 row multi-level cell into one row.

[Walter Roberson]

Did you create your own variable or function named length? Because length(scalar) is 1 for all constants. length(1920) is 1