How to find an array in a vector or matrix?

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Ehsan Ben
Ehsan Ben 2021-4-14
回答： Ahmed Redissi 2021-4-14
I want to find a specific number in a vector, and I am using the following command
[s,t] = find(q_p_d100==qp100max)
But I get the follwoing:
s =
0×1 empty double column vector
t =
0×1 empty double column vector
However, I simply need a raw and column number of the position of the number I'm looking for.
('qp100max' is the maximum number in 'q_p_d100 vector')

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采纳的回答

Jan
Jan 2021-4-14
编辑：Jan 2021-4-14
The output of FIND shows you, that qp100max is not the maximum value of q_p_d100, but it is not even an element of the vector:
any(q_p_d100 == qp100max) % FALSE
I assume, this is a rounding problem. Try it:
max(q_p_d100) - qp100max
Is this a small value?
To get the position of the maximum value:
[maxV, index] = max(q_p_d100)
If the value is not unique:
allIndex = find(q_p_d100 == maxV)

更多回答（1 个）

Ahmed Redissi
Ahmed Redissi 2021-4-14
You can use the function "ismember" to find if an array or a scalar is part of another array. Here is the documentation for it so you can learn how to use it:
https://www.mathworks.com/help/matlab/ref/double.ismember.html

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