or even simpler sqrt(abs(A)) On Mon, Dec 9, 2019 at 8:45 AM Eric Berger <ericjber...@gmail.com> wrote: > > Hi Bob, > You wrote "the following error message" - > when in fact it is a Warning and not an error message. I think your > code does what you hoped it would do, in the sense it successfully > calculates the sqrt(abs(negativeNumber)), where appropriate. > > If you want to run the code without seeing this warning message you can run > > ifelse( A < 0, suppressWarnings(sqrt(-A)), A ) > > and you should be fine. > > HTH, > Eric > > On Mon, Dec 9, 2019 at 3:18 PM Kevin Thorpe <kevin.tho...@utoronto.ca> wrote: > > > > The sqrt(-A) is evaluated for all A. The result returned is conditional on > > the first argument but the other two arguments are evaluated on the entire > > vector. > > > > Kevin > > > > -- > > Kevin E. Thorpe > > Head of Biostatistics, Applied Health Research Centre (AHRC) > > Li Ka Shing Knowledge Institute of St. Michael's > > Assistant Professor, Dalla Lana School of Public Health > > University of Toronto > > email: kevin.tho...@utoronto.ca Tel: 416.864.5776 Fax: 416.864.3016 > > > > > > On 2019-12-09, 7:58 AM, "R-help on behalf of rsherry8" > > <r-help-boun...@r-project.org on behalf of rsher...@comcast.net> wrote: > > > > Please consider the following two R statements: > > A = runif(20, min=-1,max=1) > > ifelse( A < 0, sqrt(-A), A ) > > > > The second statement produces the following error message: > > rt(-A) : NaNs produced > > > > I understand that you cannot take the square root of a negative number > > but I thought the condition A < 0 > > would take care of that issue. It appears not to be. > > > > What am I missing? > > > > Thanks, > > Bob > > > > ______________________________________________ > > 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. > > > > > > ______________________________________________ > > 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. > > ______________________________________________ > 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.
______________________________________________ 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.
