Exponentiation with negative base

ROOT
1

Hi ROOT family,

I just got a very stupid and quick question on exponentiation function pow(). I was trying to calculate (-0.25)^{1.4} by writing pow(-0.25,1.4). However, I should obtain -0.1435 as my correct result, but I got nan from ROOT. I do not know why the result for this negative base case was wrong. Thanks so much for anyone who can help!

Best,
Hao

2

https://en.cppreference.com/w/cpp/numeric/math/pow
You can find your case in “error handling”.

1 Like
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Thanks so much!

4

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