MATLAB: How to generate the matrix [1 1; 1 2; 1 3 ; 2 1; 2 2; 2 3; 3 1 ; 3 2 ; 3 3] without loops

loops

And given matrices XX and YY of sizes 3X3, how can I generate the following matrix:

[XX(1,1) YY(1,1); XX(1,2) YY(1,2);XX(1,3) YY(1,3); XX(2,1) YY(2,1); XX(2,2) YY(2,2); XX(2,3) YY(2,3); XX(3,1) YY(3,1); XX(3,2) YY(3,2); XX(3,3) YY(3,3)]

I mean of course, without writing it explicitly.

Thanks!!

Best Answer

I have no idea what your data is, but to generate the matrix in the question try:

out = unique(nchoosek([1:3, 1:3], 2), 'rows');

Related Solutions

MATLAB: Given a=[1 2 3 4 5], generate m=[2 1 3 4 5; 2 3 1 4 5; 2 3 4 1 5; 2 3 4 5 1; 1 3 2 4 5; 1 3 4 2 5; 1 3 4 5 2; 1 2 4 3 5; 1 2 4 5 3; 1 2 3 5 4].

Please find the answer of the question asked by me.

Given a=[1 2 3 4 5], generate m=[2 1 3 4 5; 2 3 1 4 5; 2 3 4 1 5; 2 3 4 5 1; 1 3 2 4 5; 1 3 4 2 5; 1 3 4 5 2; 1 2 4 3 5; 1 2 4 5 3; 1 2 3 5 4].

m=[];
k=1;
for i=1:n-1
aa=a;
aa(i)=[];
for j=i+1:n
mm=[];
mm=[aa(1:j-1),a(i),aa(j:n-1)];
m(k,:)=mm;
k=k+1;
end
end

MATLAB: Take lines from array

A = repmat([1 1 1 1; 2 2 2 2; 3 3 3 3; 4 4 4 4],16,1); % Example matrix
B = zeros(32,4); % Preallocate B
B(1:2:end) = A(1:4:end,:); % Take line 1 of every 4.th line in A
B(2:2:end) = A(2:4:end,:); % Take line 2 of every 4.th line in A

results in:

A =
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4
B =
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2
     1     1     1     1
     2     2     2     2

Best Answer

Related Solutions

MATLAB: Given a=[1 2 3 4 5], generate m=[2 1 3 4 5; 2 3 1 4 5; 2 3 4 1 5; 2 3 4 5 1; 1 3 2 4 5; 1 3 4 2 5; 1 3 4 5 2; 1 2 4 3 5; 1 2 4 5 3; 1 2 3 5 4].

MATLAB: Take lines from array

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