Relative error: not able to get the right answer.

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Hi. I am not able to get the correct value of the relative error. Grateful if you please help.
real val approx val relative error
7000 7000 0
5261 5160 1.92
4657 4869 -4.03
Matlab code:
tval = [7000 5261 4657]'
fcast = [7000 5160 4869 ]'
eabs = (tval-fcast)
erel = eabs/tval*100
Ans:
erel =
0 0 0 0 0
1.2625e+000 0 0 0 0
-2.6500e+000 0 0 0 0
Thank you

Answers (1)

Star Strider
Star Strider on 3 Sep 2019
You need to do element-wise division:
erel = eabs./tval*100
Then it comes close tho the result you want.

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