In 3.1.2 eval does not store the result of the bquote-generated call in the given environment. Interestingly, in 3.2.1 eval does store the result of the bquote-generated call in the given environment.
In other words if I run the given example with eval rather than evalq, on 3.1.2 "x" is never stored in "fenv," but it is when I run the same code on 3.2.1. However, the given example stores "x" in "fenv" on 3.1.2, but throws the error I gave when run on 3.2.1. To give credit, I received the idea for using evalq from SO: http://stackoverflow.com/a/22559385 Dayne On Wed, Jul 15, 2015 at 3:29 PM, William Dunlap <wdun...@tibco.com> wrote: > I am curious why you used evalq instead of eval in this code. > > Bill Dunlap > TIBCO Software > wdunlap tibco.com > > On Wed, Jul 15, 2015 at 11:49 AM, Dayne Filer <dayne.fi...@gmail.com> > wrote: > >> Hello, >> >> I upgraded from 3.1.2 to 3.2.1 and am receiving errors on code that worked >> as I intended previously. Briefly, I am using bquote to generate >> expressions to modify data.table objects within a function, so I need the >> changes to actually be stored in the given environment. Previously, I used >> code like the following: >> >> test <- list(bquote(x <- 10)) >> fenv <- environment() >> rapply(test, evalq, envir = fenv) >> >> Although the code in the example above is much simpler, it shows the >> problem. On 3.1.2 the expression is evaluated and x is stored as 10 in the >> given environment, fenv. In 3.2.1 the code throws an error: >> >> Error in eval(substitute(expr), envir, enclos) : object 'X' not found >> >> I could not find anything in the release notes that would explain this >> change. Changing evalq to eval works in 3.2.1, but eval does not store x >> in >> the given environment in 3.1.2. >> >> Thanks, >> >> Dayne >> >> [[alternative HTML version deleted]] >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel >> > > [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
