Find function - scalar result?

Question

Cyril CRIER 2021-4-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/796257-find-function-scalar-result

评论： Jan 2022-3-5

Hello,

I'm trying to get the row number where my "goal" value (hier max time /10) is inside my tolerance of 0.001.

%Speed_profil.motorized.time -> Vector 100x1 from 0 to 4,5sec
            Ramp=10;
            goal = (Speed_profil.motorized.time(end,1)/Ramp);
            idx_tol_mot = find(abs(Speed_profil.motorized.time-goal) < 0.001);

The fact to use the find funciton gives me a Vactor as a result.

I'm using this idx_tol_mot in an equation of the form y=ax+b to limit my Speed_profil.motorized.time vector (100x1 matrix).

Speed_profil.motorized.closing.values(1:idx_tol_mot,1) = (- a_mot * Speed_profil.motorized.time(1:idx_tol_mot,1));

Is there an alternative to the find function which can give a scalar variable? or can I convert the idx_tol_mot variable?

Thanks

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Answer 1

Jan 2021-4-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/796257-find-function-scalar-result#answer_670292

编辑：Jan 2021-4-8

在 MATLAB Online 中打开

Maybe:

idx_tol_mot = find(abs(Speed_profil.motorized.time-goal) < 0.001, 1, 'first');

or

idx_tol_mot = find(abs(Speed_profil.motorized.time-goal) < 0.001, 1, 'last');

But this the output can be empty also, if no matching values are found.

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Alexander Lachenmaier 2022-3-5

Hi,

have you found a solution to this error? I am facing the exact same problem at the Moment.

Alex

Jan 2022-3-5

@Alexander Lachenmaier: The original question wasn't clear. The OP showed a method, which replies a vector and asked, how to get a scalar. But when all we see is the code to produce a vector, it is impossible to guess, what it wanted instead.

Therefore I'm astonished, that you have "the same problem". Prefer to open a new thread and explain the details of your code.

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