Storing data from FOR loops

Good evening,

I have encountered a problem regarding data storing from FOR loops. I'm using the following code:

[~,m]=size(obs);

for j=1:m;

[~,n]=size(obs(j).data);

for i=1:n
      A=extr(eph,obs(j).data(1,i));

        B(i).data=A;

end

end

% obs is a 1x2880 structure 
% eph is a 36x212 matrix
% extr(eph,obs.data) is a function

% I want to store all values of B(i) in a new structure (1x2880)

    The problem is that my code remembers the previous stored data and adds the new data in the current structure..How I can manage this situation?

Answer 1

[Geoff Hayes]

Ciuban - you somehow need to use your j when updating B so that you don't overwrite previously stored data with the data from the current iteration. You could try creating a cell array of the structures as

 [~,m]=size(obs);

 % create an array for the structs
 allData  = cell(1,m);

 for j=1:m;
     [~,n]=size(obs(j).data);

     % size B appropriately
     B = repmat(struct('data',[]),1,n);

     for i=1:n
         A=extr(eph,obs(j).data(1,i));
         B(i).data=A;
     end

     % assign B to allData
     allData{j} = B;
 end

At each iteration, the code "resets" B given the number of columns in the jth observation data vector. At the end of the inner for loop, we just assign B to the jth element of the allData cell array. Once completed, allData is a 1x2880 cell array of structures.

[Sebastian Ciuban]

Thank you very much!