On Aug 15, 2013, at 01:46 , Gabriel Becker wrote: > R-team, > > The $value element of the return value of *withVisible* does not agree with > the return value of *eval* when *withVisible* is passed a variable (symbol) > containing an expression object or anonymous code/expressions which > generates an expression object when evaluated (such as calls to *parse* or * > expression*). > > I have attached a patch against the svn trunk which addresses this. > > Example (under devel r63577): > >> withVisible(parse(text="5+pi")) > $value > *expression(5+pi)* > > $visible > [1] TRUE > >> eval(parse(text="5+pi")) > *[1] 8.141593* >
I don't think that is a bug, it is by design. The comparison should be to what happens if you just type the expression at the prompt: > parse(text="5+pi") expression(5+pi) > With the attached patch this is no longer the case: ...so the patch introduces a bug since you can no longer withVisible() something that returns a language object. > >> withVisible(parse(text="5+pi")) > $value > *[1] 8.141593* > > $visible > [1] TRUE > > The patch changes only the withVisible function in eval.c. I'm happy to > work with / at the direction of an R-core member to get the patch into an > different form/coding style/fix strategy/etc if its current form is not > acceptable. > > Thanks, > ~G > >> sessionInfo() > R Under development (unstable) (2013-08-14 r63577) > Platform: x86_64-unknown-linux-gnu (64-bit) > > locale: > [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C > [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 > [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 > [7] LC_PAPER=en_US.UTF-8 LC_NAME=C > [9] LC_ADDRESS=C LC_TELEPHONE=C > [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C > > attached base packages: > [1] stats graphics grDevices utils datasets methods base > > > > -- > Gabriel Becker > Graduate Student > Statistics Department > University of California, Davis > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel -- 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-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
