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# Calculate percentage difference between two variables

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Muzammil Ali 2019 年 8 月 6 日

I want to calculate percentage difference between measured and calculated variables along the time axis. Both measured and preducted variables are arrays of different size. I want to calculate the percentage error for the corresponding time.

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Torsten 2019 年 8 月 6 日
percentage_error = abs(1-predicted/measured) * 100 ?
Adam 2019 年 8 月 6 日
Or
100 * ( predicted - measured ) / measured
?
Muzammil Ali 2019 年 8 月 6 日
Thank you for your answer. Yes, this is what I want but it will not work as size of the array predicted is different from size of array measured. And hence predicted(xx) is not at the same time as measured(xx).

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### 採用された回答

Luna 2019 年 8 月 6 日

You should resample one array's elements according to other array's time.
Check the below function for this:
After resampling your 2 arrays will be the same size. You can substract.

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