问题
I am running into an issue when I exponentiate floating point data. It seems like it should be an easy fix. Here is my sample code:
temp <- c(-0.005220092)
temp^1.1
[1] NaN
-0.005220092^1.1
[1] -0.003086356
Is there some obvious error I am making with this? It seems like it might be an oversight on my part with regard to exponents.
Thanks,
Alex
回答1:
The reason for the NaN is because the result of the exponentiation is complex, so you have to pass a complex argument:
as.complex(temp)^1.1
[1] -0.002935299-0.000953736i
# or
(temp + 0i)^1.1
[1] -0.002935299-0.000953736i
The reason that your second expression works is because unary - has lower precedence than ^, so this is equivalent to -(0.005220092^1.1). See ?Syntax.
来源：https://stackoverflow.com/questions/36348409/r-exponent-produces-nan