Combine multiple vectors into specific locations of one matrix

Question

Yu Takahashi 2021-2-7

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https://ww2.mathworks.cn/matlabcentral/answers/738537-combine-multiple-vectors-into-specific-locations-of-one-matrix

评论： Yu Takahashi 2021-2-9

Dear members

In short, as indicated by the title, I was trying to combine 20 vectors into one new matrix i.e., 10 each generated by condition_A and condition_B using a for loop. Specifically, assigning all condition_As to the second column, and all condition_Bs to the third column of a new matrix.

  for n = 1: 10        
        % a
        condition_a = [ repmat(23,1,6) repmat(99,1,6) ];
        condition_A = condition_a(randperm(length(condition_a)));%Vector a here  %this is to randomize the order of the numbers
     
        % b
        condition_b = [111 112 127 123 211 218 221 222 311 312 321 333 ]; 
        condition_B = condition_b(randperm(length(condition_b)));% Vector b here
        
        % other irrelevant stuff down below
  end

I apologize if this is a naive question, thanks in advance.

Please let me know if more information is needed.

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Yu Takahashi 2021-2-7

编辑：Yu Takahashi 2021-2-7

In other words, I was trying to achieve something like this

For the new matrix ：

First column : (empty)

Second column : 1st condition_A, 2nd condition_A, 3rd condition_A ... 10th condition_A

Third column : 1st condition_B, 2nd condition_B, 3rd condition_B ... 10th condition_B

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Answer 1

David Hill 2021-2-7

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You can't leave the first column empty. Why not put zeros in?

a=[6 6 6 6 6 6 99 99 99 99 99 99]';
b=[111 112 127 123 211 218 221 222 311 312 321 333 ]'; 
L=length(a);
m=zeros(10*L,3);
for k=1:10
    m(L*(k-1)+1:k*L,2)=a(randperm(L));
    m(L*(k-1)+1:k*L,3)=b(randperm(L));
end