How to store value in a two dimentinal array in matlab

I generate an array by this way.

 p=dir('C:\Users\Shahriar\Documents\EEGProject\*.csv'); 
 num=cell(size(p));
 n=length(p);
 for i=1:n
   [num{i}]=csvread(p(i).name,1,1);
 end

I try to store value in a two dimensional array B using following code, but cannot store all of them.

for i=11:20
  e = unique(num{i,1}(:,2));
  B = cell(size(e));
 for k = 1:numel(e)
   [B{k}] = num{i,1}(num{i,1}(:,2)==e(k),:);
 end   
end

Now How can i store all value of num{i,1} to B. please suggest.

[dpb]

Describe what you actually want B to contain in the end; why are you convoluting the code by stuffing an array into a cell array only to dereference it again in much more complex fashion than just using each array directly when read by csvread?

Answer 1

[dpb]

Every time you execute

   B = cell(size(e));

you create a new empty cell array of size(e) empty matrices so for every loop over i starts with a new array and the end result is just the last one, all the previous having been created but then destroyed.

The cell function needs to be outside the loop instead, then you don't need the inner loop at all--

B = cell(10);
for i=11:20
  B(i-i1+1) = unique(num{i,1}(:,2));
end