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.
