How can I create a random array like the example C?
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A=[1 1 2 2 7 7 9 9]
B=[3 5 6 8 10 11] : randomly choose all items from B and input between 2 same number of A
for example : C=[1 8 6 1 2 5 3 2 7 11 7 9 10 9]
4 个评论
KALYAN ACHARJYA
2019-4-25
编辑：KALYAN ACHARJYA
2019-4-25
Hello Hang, this is not random array, its have certain pattern. I have tried in your v1,v2 question, still not getting the exact results as per requirement.
Hang Vu
2019-4-25
Jan
2019-4-25
Please mention the details: Does the result need to have at least one value of B between the equal elements of A? Does the order of elements of B matter? Does A have an even number of elements in every case so the new elements can be inserted at the indices 2, 4, 6, ...? Providing 1 example does not define the problem completely.
Hang Vu
2019-4-26
采纳的回答
A = [1,1,2,2,7,7,9,9];
B = [3,5,6,8,10,11];
Na = numel(A);
Nb = numel(B);
Xb = randperm(Nb) % to shuffle the order of B.
Xa = randperm(Nb-1,Na/2-1);
Xa = diff([0,sort(Xa),Nb]) % the number of elements of B to pick.
T = [num2cell(A(1:2:Na));mat2cell(B(Xb),1,Xa);num2cell(A(2:2:Na))];
C = [T{:}]
Giving (for example):
Xb =
4 6 3 2 1 5
Xa =
1 2 2 1
C =
1 8 1 2 11 6 2 7 5 3 7 9 10 9
6 个评论
Hang Vu
2019-4-26
"But I quite don't understand the Xa = diff([0,sort(Xa),Nb])."
The concatenation operation [] generates a vector of indices of the ends of blocks of elements, where each block has a random length. The diff then gets those block lengths, which can be used with mat2cell. Because randperm's outputs do not repeat, this guarantees that each block contains at least one element (exactly as you requested).
"I am sorry by misunderstanding but I just realized we can allow 0 element between A"
You wrote that "at least one value of B between 2 same number of A", so that is exactly what my answer does. If you want to change the specification then clearly the code will need to be changed, e.g.:
A = [1,1,2,2,7,7,9,9];
B = [3,5];
Na = numel(A);
Nb = numel(B);
Xb = randperm(Nb) % to shuffle the order of B.
if Nb<=Na/2 % "if don't have enough B to fill in"
Xa = zeros(1,Na/2);
Xa(randperm(Na/2,Nb)) = 1; % the number of elements of B to pick.
else
Xa = randperm(Nb-1,Na/2-1);
Xa = diff([0,sort(Xa),Nb]) % the number of elements of B to pick.
end
T = [num2cell(A(1:2:Na));mat2cell(B(Xb),1,Xa);num2cell(A(2:2:Na))];
C = [T{:}]
Giving (for example):
Xb =
1 2
Xa =
0 1 1 0
C =
1 1 2 3 2 7 5 7 9 9
Hang Vu
2019-4-26
"I tried to change D, but seem it doesn't work well..:"
I have no idea what D is or how it relates to your question or my answer.
You wrote your question specifying two input vectors A and B. If you show an example with those two vectors (and explain what you expect and what you get) then I can help you further.
Hang Vu
2019-4-29
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