[Rd] Loading Cached Weaver Objects

Martin Morgan mtmorgan at fhcrc.org
Wed Oct 20 07:14:14 CEST 2010

On 10/19/2010 08:33 PM, Dario Strbenac wrote:
> Hello,
> I'm looking for a way to extract objects from what gets created when I Sweave with driver = weaver(). I found where the .Rdata objects are, but when I load one into R, I don't see anything that looks like the objects that were created in that code chunk.
>> load("/home/darstr/r_env_cache/2.11.0/AbsMeth_5/ac047940aaa9cf1a1ec09f1628b13381.RData")
>> ls()
> [1] "cacheEnv" "DEPS"     "SESSION"
> What can I try next ?

Hi Dario

Probably useful to ask the maintainer
packageDescription('weaver')$Maintainer. But from looking at the package
code I see

eval_and_cache <- function(sexpr, deps, cacheEnv, cachefile, quiet) {
    if (!quiet)
      cat("  COMPUTING... ", file=stderr())
    ## We want to pick up inherited stuff during the eval.  So no
    ## parent=emptyenv().
    eval(sexpr, envir=cacheEnv)
    DEPS <- deps
    SESSION <- sessionInfo()
    save(cacheEnv, DEPS, SESSION, file=cachefile)
    if (!quiet)
      cat("done.\n", file=stderr())

load_from_cache_env <- function(fromEnv, toEnv, hash, sym2hash, updated) {
    ## The 'updated' arg is a logical flag.  TRUE indicates that
    ## syms in fromEnv were retrieved from cache but had to be
    ## recomputed because of a dependency mismatch.  This is allows
    ## us to detect second order dependency mismatch where the
    ## expression doesn't change, but we've recomputed.
    syms <- ls(fromEnv)
    for (sym in syms) {
        assign(sym, fromEnv[[sym]], envir=toEnv)
        assign(sym, list(hash=hash, updated=updated), envir=sym2hash)

so would guess that 'cacheEnv' is a environment that contains the result
of evaluating the code in the chunk.

Hope that helps,


> --------------------------------------
> Dario Strbenac
> Research Assistant
> Cancer Epigenetics
> Garvan Institute of Medical Research
> Darlinghurst NSW 2010
> Australia
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel

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