Please take a look at FAQ 7.33
(http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-are-powers-of-negative-numbers-wrong_003f)
Basically, what you're really calculating is
-(2^2.1)
[1] -4.287094
You can't raise a negative number to a fractional power, unless
you specify it as a complex number
(-2)^2.1
[1] NaN
complex(real=-2)^2.1
[1] 4.077269+1.324785i
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Fri, 13 May 2011, 张静思 wrote:
Hi
why I can't do this?
m<-c(1,-2,3)
m^2.1
with a negative number in it ,but I can do this to a single negative number
like -2^2.1~
Thank you ~
JIngsi
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