Hello, > Negative powers mean they take the reciprocal and as far as I am > concerned, real^real is just a real number. > Am I mistaking something basic?
Yes, you are. real^real is not necessarily real. The most well known example is (-1)^0.5 = imaginary unit. When you say that -2.5^(-2.4) is real you're computing the negative power of a POSITIVE real, 2.5 then taking the result's symmetric. (-2.5)^(-2.4) [1] NaN Or (-1)^0.5 [1] NaN -1^0.5 [1] -1 (-1 + 0i)^0.5 # algebraically, equal to (-1)^0.5 above, but not in R notation. [1] 0+1i Hope this helps, Rui Barradas casperyc wrote > > Hi, > > I know what complex number are, but I am not sure what you meant by that? > > > ##############CODES########### >> 2.5^(-2.4) > [1] 0.1109032 >> -2.5^(-2.4) > [1] -0.1109032 > ##############CODES########### > > works fine. > > Negative powers mean they take the reciprocal and as far as I am > concerned, real^real is just a real number. > > Am I mistaking something basic? > > Thanks. > > Casper > -- View this message in context: http://r.789695.n4.nabble.com/problem-with-Gauss-Hermite-x-and-w-tp4622115p4624486.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
