Divide dataset into N parts, remove vectors (or Matrix) with NaN and store all subdata into one list or array

I recently switched to Matlab from R so, I am a beginner of Matlab. I have a very large dataset and below is the sample, MM2, for it. With the data MM2, I would like to divide MM2 into a unique number of MM1 (here is two, let's say N in my data) and remove all vectors of NaN for each of N subdata(there are two subdata below) and store each of subdata into one large array or something.

MM2 =

    MM1    MM2    MM3    MM4    MM5    MM6
    1      3        0    NaN    NaN     1 
    1      3        3    NaN    NaN     5 
    1      1        5    NaN    NaN     7 
    1      3        5    NaN    NaN    15 
    1      1        9    NaN    NaN     1 
    1      1       10    NaN    NaN     1 
    1      4       12    NaN    NaN     5 
    1      2       13    NaN    NaN     3 
    1      4       15    NaN    NaN     5 
    1      2       16    NaN    NaN     6 
    2      3      NaN    NaN      1     0 
    2      3      NaN    NaN      5     3 
    2      1      NaN    NaN      7     5 
    2      3      NaN    NaN     15     5 
    2      1      NaN    NaN      1     9 
    2      1      NaN    NaN      1    10 
    2      4      NaN    NaN      5    12 
    2      2      NaN    NaN      3    13 
    2      4      NaN    NaN      5    15 
    2      2      NaN    NaN      6    16

Tha is, I would like to have two data sets

First = 
MM1    MM2    MM3    MM6
  1       3        0       1  
  1       3        3       5  
  1       1        5       7  
  1       3        5      15  
  1       1        9       1  
  1       1       10       1  
  1       4       12       5  
  1       2       13       3  
  1       4       15       5  
  1       2       16       6  
Second = 
MM1    MM2    MM5    MM6
  2       3        1       0  
  2       3        5       3  
  2       1        7       5  
  2       3       15       5  
  2       1        1       9  
  2       1        1      10  
  2       4        5      12  
  2       2        3      13  
  2       4        5      15  
  2       2        6      16

And, I would like to store N subdata into one large array, list or whatever (I don't know what is the right one, list in program R). How should I do it?

[Boram Lim]

For reproduce, use this

L1 = 10; A0 = ones([L1,1]); A1 = [3;3;1;3;1;1;4;2;4;2;]; A2 = [0;3;5;5;9;10;12;13;15;16;]; A3 = [1;5;7;15;1;1;5;3;5;6;]; A4 = NaN([L1,1]) ;

MM = [A0,A1,A2,A4,A4,A3; A0*2,A1,A4,A4,A3,A2];

MM2 = mat2dataset(MM);

Answer 1

[Ameer Hamza]

The following code will divide the dataset as you specified in the question.

MM2table = dataset2table(MM2);
MM2mat = MM2table{:, :};

groups = splitapply(@(MM) {mat2dataset(MM)}, MM2mat(:,1:end), findgroups(MM2mat(:,1)));

for i=1:length(groups)
  group2mat = double(groups{i});
  nanIndex = isnan(group2mat);
  nanColumn = all(nanIndex);
  groups{i}(:, nanColumn) = [];
end