You really don't want to use internals like isBaseVar as there is no
guarantee they will continue to exist. Even collectUsage and otehr
things mentioned on the same page may need to change if this is
reimplemented.
The most robust approach is to use findGlobals and omit what you don't
want, e.g.
omit - ls(package:base, all.names=TRUE)
setdiff(findGlobals(moo),omit)
[1] y
If you do want to use chollectUsage you could use something like
funs - new.env()
omit - ls(package:base, all.names=TRUE)
enter - function(type, v, e, w){
if (! v %in% omit)
assign(v, TRUE, funs)
}
collectUsage(moo, enterGlobal = enter)
If %in% is too slow create a hashed envorinment and use exists().
Best,
luke
On Tue, 15 Jan 2013, Saptarshi Guha wrote:
Sorry for reposting, i keep forgetting this should be plain text.
Will not make this mistake again
Hello,
The following code
moo - function(a=1){ x=1; x=x+y}
funs - new.env()
enter - function(type, v, e, w){
assign(v, TRUE, funs)
}
library(codetools)
collectUsage(moo, enterGlobal = enter)
adds + to the environment funs i.e.
funs: = { + y
How can i ignore variables which are present in base, utils, stat
environments from being added (equivalently(?) symbols present in R
when R is started)
I tried
funs - new.env()
enter - function(type, v, e, w){
if(codetools:::isBaseVar(v, w$env) || codetools:::isStatsVar(v, w$env)
|| codetools:::isUtilsVar(v, w$env) || v == Quote)
return()
assign(v, TRUE, funs)
}
library(codetools)
collectUsage(moo, enterGlobal = enter)
but this threw
Error in exists(v, envir = e, inherits = FALSE, mode = function) :
invalid 'envir' argument
Cheers
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Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics andFax: 319-335-3017
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