Hi AFAIK, this is issue of the preference of operators.
[email protected] napsal dne 16.11.2009 11:24:59: > Hi, > I want to apply ^ operator to a vector but it is applied to some of the > elements correctly and to some others, it generates NaN. Why is it not able to > calculate -6.108576e-05^(1/3) even though it exists? > > > tmp > [1] -6.108576e-05 4.208762e-05 3.547092e-05 7.171101e-04 -1.600269e-03 > > tmp^(1/3) > [1] NaN 0.03478442 0.03285672 0.08950802 NaN This computes (-a)^(1/3) which is not possible in real numbers. You have to use as.complex(tmp)^(1/3) to get a result. > > -6.108576e-05^(1/3) > [1] -0.03938341 this is actually -(6.108576e-05^(1/3)) Regards Petr > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
