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Is minus accuracy possible with 'compare' function?

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CHOI HYUNDUK
CHOI HYUNDUK on 14 Feb 2019
I used 'compare' function of Matlab to get the accuracy.
When the error between measuared data and optimized data is large, the accuracy has minus value like -40%.
Is it possible and can that trust?
I wonder the minus accuracy meaning by the point of view of mathmatical.

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