> On 18 Sep 2015, at 16:31 , John McKown <john.archie.mck...@gmail.com> wrote: > > ref: https://en.wikipedia.org/wiki/Order_of_operations > <quote> > > If exponentiation is indicated by stacked symbols, the usual rule is to > work from the top down, thus: > [image: a^{b^c} = a^{(b^c)}], [snip]
...and it might be added that this is (in "paper math") because (a^b)^c==a^{bc} and there would be no point in writing a^b^c if you might as well have written a^{bc}. (The curly braces only being there to indicate that the exponent is bc.) Of course this sort of consideration hasn't always had effect on programmers, so you do need to check. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.