Strange result of find function
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Hello,
I noticed a strange results of the find function today.
I am using the find function to extract the indices of a time serie that is contained inside a structure. The find function does find a result but it is however not the correct one and I do not understand why.
To be clearer here is the code I'm using:
t(1) = 10e-9;
t(2) = 25e-9;
t(3) = 35e-9;
t(4) = 40e-9;
Time_indices = find(abs([files(index).data.time]-t')< eps);
This gives the following result:
Time_indices =
100
651
1152
1603
However, my time series array size is 401x1 double so the indices are wrong apart from the first one. However, if I run the same find function but in a for loop, discretizing the t values I get the expected result:
for i=1:4
test(i) = find(abs([files(index).data.time]-t(i))< eps);
end
test
test =
100 250 350 400
I'm not sure if I'm using find wrong or if there is an issue here, if someone has any insight into this that would be helpful for my understanding.
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Réponse acceptée
Jan
le 8 Sep 2021
% Time_indices = find(abs([files(index).data.time]-t')< eps);
% ^
If t and [files(index).data.time] are row vectors, the transposition of t replies a matrix:
a = 1:4;
b = 1:4;
a - b'
Now the find() command gets the linear indices of the matrix elements.
Maybe using 2 outputs for the find() command solve your needs. Or try ismembertol .
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