How to Permute the array with specific number?
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I want to keep 1,2,6,7,9,10, they will not move
I have this array
b=[1,5,2,8,6,11,7,9,3,10]
P=perms(b);
HOw to use perms for 3,5,8,11 among 6 numbers above?
0 Comments
Accepted Answer
Stephen23
on 29 May 2019
>> b = [1,5,2,8,6,11,7,9,3,10];
>> idx = ~ismember(b,[1,2,6,7,9,10]);
>> mat = repmat(b,factorial(nnz(idx)),1);
>> mat(:,idx) = perms(b(idx))
mat =
1 11 2 8 6 5 7 9 3 10
1 11 2 8 6 3 7 9 5 10
1 11 2 5 6 8 7 9 3 10
1 11 2 5 6 3 7 9 8 10
1 11 2 3 6 8 7 9 5 10
1 11 2 3 6 5 7 9 8 10
1 8 2 11 6 5 7 9 3 10
1 8 2 11 6 3 7 9 5 10
1 8 2 5 6 11 7 9 3 10
1 8 2 5 6 3 7 9 11 10
1 8 2 3 6 11 7 9 5 10
1 8 2 3 6 5 7 9 11 10
1 5 2 11 6 8 7 9 3 10
1 5 2 11 6 3 7 9 8 10
1 5 2 8 6 11 7 9 3 10
1 5 2 8 6 3 7 9 11 10
1 5 2 3 6 11 7 9 8 10
1 5 2 3 6 8 7 9 11 10
1 3 2 11 6 8 7 9 5 10
1 3 2 11 6 5 7 9 8 10
1 3 2 8 6 11 7 9 5 10
1 3 2 8 6 5 7 9 11 10
1 3 2 5 6 11 7 9 8 10
1 3 2 5 6 8 7 9 11 10
6 Comments
Stephen23
on 29 May 2019
Edited: Stephen23
on 29 May 2019
Here is a simple but not-very-efficient solution (warning: generates all permutations and discards invalid ones) (note that 1 and 10 have been ignored to make the code simpler):
b = [5,2,8,6,11,7,9,3];
V = [2,6,7,9]; % fixed
P = perms(b);
[X,Y] = ismember(P.',V);
R = reshape(Y(X),[],size(P,1));
D = all(diff(R,1,1)>0);
Z = P(D,:)
Giving:
Z =
3 11 8 2 6 7 9 5
3 11 8 2 6 7 5 9
3 11 8 2 6 5 7 9
3 11 8 2 5 6 7 9
3 11 8 5 2 6 7 9
3 11 2 6 8 7 9 5
3 11 2 6 8 7 5 9
3 11 2 6 8 5 7 9
3 11 2 6 7 8 9 5
... lots of lines here
5 3 2 11 6 7 8 9
5 3 2 11 6 7 9 8
5 3 2 11 8 6 7 9
5 3 2 6 11 8 7 9
5 3 2 6 11 7 8 9
5 3 2 6 11 7 9 8
5 3 2 6 8 11 7 9
5 3 2 6 8 7 11 9
5 3 2 6 8 7 9 11
5 3 2 6 7 8 11 9
5 3 2 6 7 8 9 11
5 3 2 6 7 11 8 9
5 3 2 6 7 11 9 8
5 3 2 6 7 9 11 8
5 3 2 6 7 9 8 11
5 3 2 8 6 11 7 9
5 3 2 8 6 7 11 9
5 3 2 8 6 7 9 11
5 3 2 8 11 6 7 9
More Answers (1)
Jan
on 28 May 2019
Edited: Jan
on 28 May 2019
You did not mention how the output should look like. Perhaps:
b = [1,5,2,8,6,11,7,9,3,10];
keep = [1,2,6,7,9,10];
move = ~ismember(b, keep);
P = perms(b(move));
R = repmat(b, size(P,1), 1);
R(:, move) = P
6 Comments
Jan
on 29 May 2019
@Hang Vu: I do not understand, what you mean. You solved the problem, but this is another one? Is the problem of your question solved or not?
"if the moving numbers move then you will see the keeping move..." - what does this mean?
Please explain exactly, what you want to achieve.
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