Concatenating in a new matrix from inside a while loop

Hiee.. I am trying store the new values of TP in a new matrix after some TP values are deleted inside the loop as the conditions are met. Then again, after the inside while loop ends, i want to set new conditions and perform operation on the old TP values and keep storing it in new matrix to perform some other condition on the new TP value and keep doing it. I am not able to find the right way of doing it. I would be very grateful for anyone's help expert in matlab. Thank you

s=1;
k=1;
num_pos= 1;
che= [0.01:0.05:10]';
size(che);
     while s < length(che)
        TP=X; %X is a n by 2 matrix
            while k < length(D) 
                if D(num_pos,1) > abs(che(s)*xstd+xmean)
                    TP(num_pos,:)=[];
                else
                    TP(num_pos,:) = X(num_pos,:);
                    num_pos = num_pos+1;   
                end
                k =  k+1;    
            % want to store the new TP values in a matrix(e.g "newmatrix") of n1 by 2
            sensitivity(s) = (length(newmatrix)/250);
            end
          % bring my Old TP value which is equal to X ( n by 2 ) matrix
          s=s+1;
    end

Answer 1

[KSSV]

YOu may initialize your newmatrix as nx2x2 matrix, stroe oldTP at 1 and new TP at 2. The below one will work with few changes accordingly.

    s=1;
  k=1;
  num_pos= 1;
  che= [0.01:0.05:10]';
  size(che);
  n=600;
  count1 = 0 ;
  sensitivity = cell([],[]) ;
  while s < length(che)
      count1 = count1+1 ;
      count2 = 0 ;
      TP=X; %X is a n by 2 matrix
      newmatrix(:,:,1) = TP ;
      while k < length(D)
          count2 = count2+1 ;
          if D(num_pos,1) > abs(che(s)*xstd+xmean)
              TP(num_pos,:)=[];
          else
              TP(num_pos,:) = X(num_pos,:);
              num_pos = num_pos+1;
          end
          k =  k+1;
          new_matrix= TP ;
          % want to store the new TP values in a matrix(e.g "newmatrix") of n1 by 2
          sensitivity{count1,count2} = (length(new_matrix)/250);
      end
      % bring my Old TP value which is equal to X ( n by 2 ) matrix
      TP = newmatrix(:,:,1) ;
      s=s+1;
  end
  sensitivity;

[HIRAKJYOTI BASUMATARY]

Sir, i have edited the code and got the required results. Thank you very much sir. Now i am having trouble to store the sensitivity value from each loop, which is i think will be able to tackle.

s=1;
k=1;
num_pos= 1;
che= [0.01:0.05:10]';
size(che);
n=600;

       while s < length(che)
          TP=X; %X is a n by 2 matrix
          newmatrix(:,:,1) = TP ;
              while k < length(D) 
                  if D(num_pos,1) > abs(che(s)*xstd+xmean)
                      TP(num_pos,:)=[];
                  else
                      TP(num_pos,:) = X(num_pos,:);
                      num_pos = num_pos+1;   
                  end
                  k =  k+1;  
                  new_matrix= TP ;
              % want to store the new TP values in a matrix(e.g "newmatrix") of n1 by 2
              sensitivity(s) = (length(new_matrix)/250);
              end
            % bring my Old TP value which is equal to X ( n by 2 ) matrix
           TP = newmatrix(:,:,1) ;
           s=s+1;
      end
  sensitivity;

[KSSV]

I have edited the answer..to save sensitivity.