MATLAB: Every iteration gives me a column vector of non zero elements. How to store them, all the columns, in either a single vector or an array? Attached is the sample code.

store non zero elements

close all; clear; clc;
STORE = nan(30,2);
for k = 1:2 
  rows = 4; columns = 3;
  x = randi([0 3],rows,columns);
  store = zeros(rows,columns);
  Xstore = nan(30,2);
  for j = 1:3
          for i = 1:rows
          store(i,j) = x(i,j);
          %Xstore = store(store>0)
          Xstore = nonzeros(store)
          STORE(:,k) = Xstore; % This step does not walk, please
          end
  end
end

Best Answer

The dimensions of what you want to store are varying...use cell instead.
close all; clear; clc;
STORE = cell(2,1);
for k = 1:2
    rows = 4; columns = 3;
    x = randi([0 3],rows,columns);
    store = zeros(rows,columns);
    Xstore = nan(30,2);
    for j = 1:3
        for i = 1:rows
            store(i,j) = x(i,j);
            %Xstore = store(store>0)
            Xstore = nonzeros(store) ;            
            STORE{j,i,k} = Xstore; % This step does not walk, please
        end
    end
end
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