Non-repeating selection from sets

2023 12 27
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A is 1 by a matrix, B 1 by b, and C 1 by c. D is supposed to be the set of all non-repeating selection of respectively A, B, and C columns. What would be the most economical code of triples extraction? Thanks.

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Dyuman Joshi
Dyuman Joshi 2023-12-27
编辑：Dyuman Joshi 2023-12-28
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%Random data
A = 1:3;
B = 1:4;
C = 1:5;
D = {A, B, C}
D = 1×3 cell array
{[1 2 3]} {[1 2 3 4]} {[1 2 3 4 5]}
n = numel(D);
%Preallocate
out = cell(1, n);
%Reverse order to get the lexicographical order when concatenating
[out{end:-1:1}] = ndgrid(D{end:-1:1});
%Concatenate and reshape the data corresponding to number of vectors
out = reshape(cat(n,out{:}),[],n);
disp(out)
1 1 1 1 1 2 1 1 3 1 1 4 1 1 5 1 2 1 1 2 2 1 2 3 1 2 4 1 2 5 1 3 1 1 3 2 1 3 3 1 3 4 1 3 5 1 4 1 1 4 2 1 4 3 1 4 4 1 4 5 2 1 1 2 1 2 2 1 3 2 1 4 2 1 5 2 2 1 2 2 2 2 2 3 2 2 4 2 2 5 2 3 1 2 3 2 2 3 3 2 3 4 2 3 5 2 4 1 2 4 2 2 4 3 2 4 4 2 4 5 3 1 1 3 1 2 3 1 3 3 1 4 3 1 5 3 2 1 3 2 2 3 2 3 3 2 4 3 2 5 3 3 1 3 3 2 3 3 3 3 3 4 3 3 5 3 4 1 3 4 2 3 4 3 3 4 4 3 4 5

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Dyuman Joshi
Dyuman Joshi 2023-12-28
Ran in:
Ran in:
What is the expected output in this case?
Is the one given by this code not the one you want?
A = [2 3 4];
B = 5;
C = [6 8];
D = {A, B, C}
D = 1×3 cell array
{[2 3 4]} {[5]} {[6 8]}
n = numel(D);
%Preallocate
out = cell(1, n);
%Reverse order to get the lexicographical order when concatenating
[out{end:-1:1}] = ndgrid(D{end:-1:1});
%Concatenate and reshape the data corresponding to number of vectors
out = reshape(cat(n,out{:}),[],n);
disp(out)
2 5 6 2 5 8 3 5 6 3 5 8 4 5 6 4 5 8
Dyuman Joshi
Dyuman Joshi 2023-12-28
Are using the same code as above?
Please share the full error message i.e. all of the red text.
Amir Mahmoudi
Amir Mahmoudi 2023-12-28
Your code is working precisely. I had made a minor mistake. Thanks.
Amir Mahmoudi
Amir Mahmoudi 2023-12-28
I deleted my previous comments.

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