Generating combination of matrix with 3 elements

I want to optimally generate a 100 matrix, of size MxN using the combination of 3 elements (0,1,2) and save them into seperate mat files. Can someone please help. I dont want to generate the matrix randomly.

[David Hill]

What do you mean by 1000 matrix? Do you just want the permutations of (0,1,2)?

p=perms([0 1 2]);

[Jan]

I don't get it: Why 100 matrices? What kind of combinations do you mean? If they are not random, what procedure is wanted instead?

perms(0:2)

ans = 6×3

2 1 0 2 0 1 1 2 0 1 0 2 0 2 1 0 1 2

And now?

By the way: This is not twitter: no hash before the tags.

[Shourya]

@David Hill @Jan I am sorry about that. I want to generate 100 mat files in more optimal way when it comes to the series of 3 elements in a row. I dont want to repeat the rows in a matrix. My matrix size is 64x12. Is there a way I can do it?

Answer 1

[David Hill]

So each row of 12 elements can only contain the elements [0 1 2] ? Are there any other contrains? How many times can each element be repeated in each row? Why don't you want to generate the matrix randomly?

A=[repmat([0 1 2],1,12)];
N=zeros(64,12,100);
for m=1:100
 for k=1:100
   M(k,:)=A(randperm(numel(A),12));
 end
 M=unique(M,'rows');
 N(:,:,m)=M(1:64,:);
end

[Shourya]

Thank you for your response. As I am preparing a dataset for my problem, I want to avoid repeating rows in a single matrix as much as possible. Yes,each row of 12 elements can only contain the elements [0 1 2]. However, there is no limit on the number of repeated elements.

While the above code is helpful, can you please tell me how to save these 100 matrices as separate mat files. I want to generate 100 separate matrix files of size 64x12. I tried using " save(['N' num2str(m) '.mat'],'N');" I am getting each file with 100 matices.

[David Hill]

Why not just save a single file that contains all 100 matrices (3rd dimension of N).

save('yourMatrix','N');

[Shourya]

Thank you. I want just 2D matrix as I will be using each of them seperately as input. Is there a way I can save them?

[David Hill]

It is always much easier to code using indexing instead of having a bunch of variables. A 3D matrix (N) can be indexed to obtain all 100 of your 2D matrices.

M1=N(:,:,1);%is a 2D matrix
M2=N(:,:,2);%is a 2D matrix
M3=N(:,:,3);%is a 2D matrix
M100=N(:,:,100);%is a 2D matrix

All 100 of your 2D matrices are stored in a single 3D matrix.

[Shourya]

Hello David, I shall do that thank you for the solution!