About the use of find
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I want to detect values greater than 10 and get their indices.
In my case, I'm using find to get the index as follows.
y = find( x > 10 );
I think find is finding the value greater than 10 in all elements of x and getting the index.
So I have a question.
Does find start computing at the moment when all the elements of x are given, rather than at the moment when any element of x is given?
I would like to perform the computation at the moment when even one element of x is given, do the same process as find, get the same index, and store it in the same way.
In that case, what kind of program should I write? It would be great if you could post your program.
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回答 (1 件)
Wan Ji
2021 年 8 月 23 日
Find is not at all faster than logical inices.
IF you know how to use logical indices to get elements from matrix. I believe you will like it.
A = [true, false, true, false]; % logical inices
B = [4,3,5,6];
B(A) % this gets the value in B corresponds to true element in A
Then
ans =
4 5
But find should have such a following process
p = find(A);
B(p)
Also,
ans =
4 5
Find sometimes can be implemented by
n = 1:1:length(A);
p = n(A)
Then
p =
1 3
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