[R] approxfun + save: problem as R_approx changed package

[Ugoccioni Roberto]

Hi all,
I recently switched to R version 2.6.2 (from 2.5.0 I was using) on Windows XP.
I have a fair amount of previous data saved in the form of "approxfun" objects created by version 2.5.0, with code basically like this:

> x <- rlnorm(100,10,2)
> f <- approxfun(1:100,x)
> f(5)
[1] 313811.3
> save(f, file="mytest_approx.Rdata")

Now on 2.6.2, when I try to reuse the saved object I get an error:

> attach("mytest_approx.Rdata")
> f(5)
Error in .C("R_approx", as.double(x), as.double(y), as.integer(n), xout = as.double(v),  :
  C symbol name "R_approx" not in DLL for package "base"


If I create the approxfun in 2.6.2 and use it in 2.5.0, I get a "mirrored" error:
Error in .C("R_approx", as.double(x), as.double(y), as.integer(n), xout = as.double(v),  :
        C symbol name "R_approx" not in DLL for package "stats"

It seems to me the two versions of R are looking for the same thing in different places, is it because of the environment they carry?
Can anyone suggest a way to work around this situation?

Thanks,
  Roberto

----
 Roberto Ugoccioni
 Intesa Sanpaolo SpA
 Servizio Operational Risk Management
 Ufficio Sviluppo e Gestione del Sistema ORM
 Via Monte di Pietà 26
 10122 Torino
 Italy
-----


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