Select sequence of numbers from Array

Question

Jochem 2023-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/1905276-select-sequence-of-numbers-from-array

评论： Dyuman Joshi 2023-2-2

Lets say I have an array like so:

[1 1 1 2 2 2 3 3 3 4 4 4 1 1 1 2 2 2 3 3 3 4 4 4 1 1 1 2 2 2 3 3 3 4 4 4 1 1 1 2 2 2 3 3 3 4 4 4]

(my real array is 3635 long)

I want to make a new array which shows which indexes have an nth time of sequence of 1's.

So like this:

the 3rd time the 1's are in sequence so in this case i would like it to return: [37 38 39]

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Dyuman Joshi 2023-2-2

Is the real array same/similar as this one? Because there's a repeating pattern here so you can easily get the indices.

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Answer 1

Stephen23 2023-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/1905276-select-sequence-of-numbers-from-array#answer_1162326

在 MATLAB Online 中打开

V = [1 1 1 2 2 2 3 3 3 4 4 4 1 1 1 2 2 2 3 3 3 4 4 4 1 1 1 2 2 2 3 3 3 4 4 4 1 1 1 2 2 2 3 3 3 4 4 4];
X = V(:)==1;
Y = cumsum(diff([0;X])>0);
Z = 1:numel(V);
C = accumarray(Y(X),Z(X),[],@(a){a})
C = 4×1 cell array
    {3×1 double}
    {3×1 double}
    {3×1 double}
    {3×1 double}
C{:}
ans = 3×1
     1
     2
     3
ans = 3×1
    13
    14
    15
ans = 3×1
    25
    26
    27
ans = 3×1
    37
    38
    39