How to deal with the presence of [] during the summation of arrays

Hi all，

There are four columns in each row, I want to add four arrays in each row to get a new array, but some of the rows have [], and I get an error when I run the addition, how can I handle it? The screenshot of structure is presented following:

I wrote some code, but it was wrong and did not work

for m = 1 : 5
       if ~isempty(O(m).A1) || ~isempty(O(m).A2) || ~isempty(O(m).A3) || ~isempty(O(m).A4) 
           O(m).A5 = O(m).A1 + O(m).A2 + O(m).A3 + O(m).A4;
       end
end

Thanks in advance for the support and help!

Answer 1

[Srivardhan Gadila]

One possible way is as follows:

a = [];
b = [];
c = randn(10,1);
d = randn(10,1);

sumResult = sum(cat(2,a,b,c,d),2);

Refer to the documentation of functions sum & cat for more information.