Find where certain sequence of true/falses is placed inside a logical array

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Enrico Gambini 2022-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1825298-find-where-certain-sequence-of-true-falses-is-placed-inside-a-logical-array

编辑： Enrico Gambini 2022-10-13

采纳的回答： David Hill

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Hello!

Assume that I have the following logical array:

x=[false;false;true;true;true;true;true;false;true;true;true]'
x = 1×11 logical array
   0   0   1   1   1   1   1   0   1   1   1

I would like to construct a logical array which returns true at the index where the sequence [true;false;true] is found

Hence the result would look like this

result=[false;false;false;false;false;false;true;false;false;false;false]'
result = 1×11 logical array
   0   0   0   0   0   0   1   0   0   0   0

Hope that the question is clear, thank you!

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Answer 1

David Hill 2022-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1825298-find-where-certain-sequence-of-true-falses-is-placed-inside-a-logical-array#answer_1073928

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x=[false;false;true;true;true;true;true;false;true;true;true]';
f=strfind(x,[1 0 1]);
result=zeros(size(x));
result(f)=1
result = 1×11
     0     0     0     0     0     0     1     0     0     0     0

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Enrico Gambini 2022-10-13

编辑：Enrico Gambini 2022-10-13

在 MATLAB Online 中打开

Thank you!

For my purposes I would slightly change the code like this:

x=[false;false;true;true;true;true;true;false;true;true;true]';
f=strfind(x,[1 0 1]);
result=false(size(x));
result(f)=true
result = 1×11 logical array
   0   0   0   0   0   0   1   0   0   0   0