[R-pkg-devel] Trying to work around missing functionality

[Richard M. Heiberger]

Does this solve the problem?

if (getRversion() >= '2.15.1')
  globalVariables(c('envroot'))

I keep this in file R/globals.R

I learned of this from John Fox's use in Rcmdr.

On Mon, Aug 27, 2018 at 8:28 PM, J C Nash <profjcnash using gmail.com> wrote:
> In order to track progress of a variety of rootfinding or optimization
> routines that don't report some information I want, I'm using the
> following setup (this one for rootfinding).
>
> TraceSetup <- function(ifn=0, igr=0, ftrace=FALSE, fn=NA, gr=NA){
> # JN: Define globals here
>    groot<-list(ifn=ifn, igr=igr, ftrace=ftrace, fn=fn, gr=gr, label="none")
>    envroot <<- list2env(groot) # Note globals in FnTrace
>    ## This generates a NOTE that
>    ## TraceSetup: no visible binding for '<<-' assignment to ‘envroot’
> ##   envroot<-list2env(groot, parent=.GlobalEnv) # Note globals in FnTrace -- this does NOT work
>    ## utils::globalVariables("envroot") # Try declaring here -- causes errors
> # end globals
>    envroot
> }
>
> FnTrace <- function(x,...) {
>   # Substitute function to call when rootfinding
>   # Evaluate fn(x, ...)
>     val <- envroot$fn(x, ...)
>     envroot$ifn <- envroot$ifn + 1 # probably more efficient ways
>     if (envroot$ftrace) {
>        cat("f(",x,")=",val," after ",envroot$ifn," ",envroot$label,"\n")
>     }
>     val
> }
>
>
> Perhaps there are better ways to do this, but this does seem to work quite well.
> It lets me call a rootfinder with FnTrace and get information on evaluations of fn().
> (There's another gr() routine, suppressed here.)
>
> However, R CMD check gives a NOTE for
>
>   TraceSetup: no visible binding for global variable ‘envroot’
>   Undefined global functions or variables:
>     envroot
>
> The commented lines in TraceSetup suggest some of the things I've tried. Clearly I don't
> fully comprehend how R is grinding up the code, but searches on the net seem to indicate
> I am far from alone. Does anyone have any suggestion of a clean way to avoid the NOTE?
>
> JN
>
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