[Rd] Saving Rcpp Objects for Future Use

From: Michael King <wmichaelking1_at_gmail.com>
Date: Fri, 09 Sep 2011 16:07:25 -0400


I have recently been doing some research regarding how to successfully save and load Rcpp Objects ( objects from modules ) for future use, but with little success. For example, to use the example package (from package skeleton) in Rcpp:

>Rcpp.package.skeleton("rdevelhelp", module=TRUE)
> q()

// install rdevelhelp using R CMD INSTALL // load new R Session

>x <- new(World)
>x$set("help me")

"help me"
>save(x, "x.RData")

// reload R
> ### here comes the problem...
> x$greet()

Error in .External(list(name = "CppMethod__invoke_notvoid", address = <pointer: 0x0>, :
  NULL value passed as symbol address


is there a best practice to solving this problem? I have read some posts about external pointers and have learned a little about serialization, but want to make sure I am approaching the problem correctly.

Thanks for your help.


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