Hi, Without a reproducible example (providing data with dput(), please) it's hard to say for certain, but my suspicion is that this is a R FAQ 7.31 issue.
Sarah On Mon, Mar 10, 2014 at 11:26 AM, Cesar Caballero <c.caball...@bcbl.eu> wrote: > Hi R-users, > > I am facing a strange behaviour that changes the sign of Inf with a division > by zero. > > In my script, I have defined the following 3 variables and the elementwise > division: > >> lambda_k[gamma_lambda] # numeric vector > [1] -1 0 >> del_lambda[gamma_lambda] # numeric vector > [1] 0 -1 >> gamma_lambda # integer vector with the indexes of the elements in lambda_k >> & del_lambda > [1] 74 11 >> lambda_k[gamma_lambda] / del_lambda[gamma_lambda] > [1] Inf 0 > > The result is surprising instead of -Inf 0 which I would expect because the > elementwise division of the elements with index 74 is -1/0. > > > Surprisingly, if I try to do the division with just newly defined numeric > vectors with the same values, I obtain the correct result, i.e. >> c(-1,0) / c(0,-1) > [1] -Inf 0 > > > How can this be explained? Any input would be really welcomed. > > For your information, I'm using R version 3.0.2 (2013-09-25) and Rstudio > Version 0.98.501 on Platform: x86_64-apple-darwin10.8.0 (64-bit). > > > Thanks very much for your help, > > Cesar > -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.
