It is the order of operator precedence. Look at what you typed: -8^1/3 is parsed as -(8^1)/3 = -2.66666
On Sun, Jul 19, 2009 at 1:12 PM, Victor Manuel Garcia Guerrero<vmgar...@colmex.mx> wrote: > It' true, but if you type -8^(1/3) returns -2, and if you type -8^1/3 it > returns -2.66666, maybe there are some rules about parenthesis... > > regards > > Víctor > > > ________________________________ > > De: r-help-boun...@r-project.org en nombre de Dave DeBarr > Enviado el: sáb 18/07/2009 05:04 > Para: r-help@r-project.org > Asunto: [R] (-8)^(1/3) == NaN? > > > > Why does the expression "(-8)^(1/3)" return NaN, instead of -2? > > This is not answered by > http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-are-powers-of-negative-numbers-wrong_003f > > Thanks, > Dave > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. > > ______________________________________________ > 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. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? ______________________________________________ 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.
