----- Original Message ----- > From: "Adam Welc" <adamw...@yahoo.com> > To: r-devel@r-project.org > Sent: Wednesday, April 2, 2014 3:11:28 PM > Subject: [Rd] inconsistent error messages on Mac OS X > > Hi All, > > I am one of the contributors to the FastR project ( > https://bitbucket.org/allr <https://bitbucket.org/allr.>) and I have > encountered an interesting issue when trying to implement vector > accesses > within FastR. I am trying to understand what kind of error message > should > be generated for the following expression: > > x<-1:4; x[[1]]<-NULL; x > > In order to determine the error message, I ran the shell of standard > GNU R > (installed via MacPorts - R version 2.15.3) on Mac OS X 10.8.5 as > follows, > with R metadata (that is .RData or .Rhistory files) removed from the > current directory
Instead you should probably start R as follows: R --vanilla ?Startup explains why removing .RData etc from the current directory is not enough, in the absence of --vanilla. >(I have edited portions of the R header printed > when the > shell starts for the sake for readability): > > Adams-MacBook-Air:work adam$ R > > R version 2.15.3 (2013-03-01) -- "Security Blanket" > Copyright (C) 2013 The R Foundation for Statistical Computing > ISBN 3-900051-07-0 > Platform: x86_64-apple-darwin12.3.0/x86_64 (64-bit) > ... > ... > Type 'q()' to quit R. > > > x<-1:4; x[[1]]<-NULL; x > Error in x[[1]] <- NULL : > incompatible types (from NULL to integer) in [[ assignment > > q() > Save workspace image? [y/n/c]: n > > > Adams-MacBook-Air:work adam$ R > > R version 2.15.3 (2013-03-01) -- "Security Blanket" > Copyright (C) 2013 The R Foundation for Statistical Computing > ISBN 3-900051-07-0 > Platform: x86_64-apple-darwin12.3.0/x86_64 (64-bit) > ... > ... > Type 'q()' to quit R. > > > x<-1:4; x[[1]]<-NULL; x > Error in x[[1]] <- NULL : > more elements supplied than there are to replace > > > > > As you can see, the error message for the same expression is > different on > two subsequent executions of the GNU R shell (with no workspace image > saving - but it does not matter, as I observe the same behavior if > the > workspace is saved). > > I tried the same thing on Linux, but there the behavior seems > consistent > (the second message is displayed in each execution). > > This issue is not specific to this single expression - it happens in > other > (though not all) cases when the NULL value is assigned to an element > of a > vector. > > I was wondering if someone has observed the same behavior and perhaps > knows > what may be causing it... > I can't reproduce this on R Under development (unstable) (2013-10-12 r64048) with or without --vanilla, it consistently gives the second error message. Dan > Thank you > > Adam > > [[alternative HTML version deleted]] > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
