Find index where condition is true, or end of matrix

Question

Bob Thompson 2021-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/822290-find-index-where-condition-is-true-or-end-of-matrix

回答： Bob Thompson 2021-5-5

I have an array that represents the time based states of an analysis. I want to search the array for where a certain state starts, and if the state doesn't exist, then pick the final index of the array.

statestart = find(Results.state==5,1); % Find index of first time state is 5
if isempty(statestart)
    statestart = numel(Results.state);
end

I know this works, but I would like to know if it's possible to get the same result without an if statement.

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Mario Malic 2021-5-5

编辑：Mario Malic 2021-5-5

Maybe you could create a vector that contains states that are within Results.state using unique, that way you could skip on checking for non-existant states.

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Answer 1

Bob Thompson 2021-5-5

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在 MATLAB Online 中打开

I appreciate the input, this is the best I was able to do:

statestart = [find(Results.state==5,1) numel(Results.state)];
statestart(1)

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Answer 2

Jonas 2021-5-5

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you could set the last entry to the condition you are searching for and then use your find function. this way at least one index can be found where the condition is met