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How to find X value of given Y close to zero ?

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Prince Alex
Prince Alex 2020-7-15
评论： Prince Alex 2020-7-16
How to find the value of Y more close to zero first (note Y consists of both positive and negative numbers) and then find the corresponding X value ? Many thanks in advance.
Lets say I have X and Y given by
X=[-51 -41 -31 -21 -11 1 11 21 31 41]
Y=[0.003 -0.002 0.004 0.0002 -0.05 0.0003 -0.001 0.006 0.01 0.0012]
  2 个评论
Stephen23
Stephen23 2020-7-15
What is the expected output from this example data?
Prince Alex
Prince Alex 2020-7-15
Y is 0.0002 and corresponding X value is -21. I jus given an example, I have a bit data set having 90k points and from that I have to find the Y value more close to zero and corresponding X value. Thank you.

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KSSV
KSSV 2020-7-15
[val,idx] = sort(abs(Y)) ;
Y(idx)
X(idx)

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