Find a specific array within a larger array

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james ingham 2023-11-28

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https://ww2.mathworks.cn/matlabcentral/answers/2053062-find-a-specific-array-within-a-larger-array

移动：Dyuman Joshi 2023-11-28

Hi all,

I am struggling with a problem. I have a large array, for example a = [11 12 13 14 15 16 13 14], and I want to find the index for a specfic sub sequence eg. b = [13 14 15]. So in this example I would want the index of 3 to indicate the position that b started in a. I dont want to know the indices of a that any number within b, i instead need them to be specifically in the order b, ie I dont care about the last two 13 14 numbers in a as it isnt the entirety of b.

I know I could simply do a loop that checks b against a subset of a and loops throughout the whole of a but this seems a little ineffectient if a is very big, (in my acutal code a is many 100,000's of numbers in length).

Is there a more efficent way, any help is appreiacted.

Thanks

J

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Dyuman Joshi 2023-11-28

移动：Dyuman Joshi 2023-11-28

在 MATLAB Online 中打开

a = [11 12 13 14 15 16 13 14]
a = 1×8
    11    12    13    14    15    16    13    14
b = [13 14 15]
b = 1×3
    13    14    15
strfind(a, b)
ans = 3