R help - Jun 2008 - error related to approxfun in R 2.7.0

I'm testing R version 2.7.0 on windows and there seems to be a
compatibility issue with objects that were created by "approxfun" in
older versions. As long as the objects were created in version 2.7.0
things work ok, but calling the interpolated functions from R version
2.0.1 causes this 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 "base"

What's the problem and how can t be resolved (need to be compatible
with old data)?

Regards,
K

>>>>> "KM" == Karl Marx <tammisiech at gmail.com>
>>>>>     on Thu, 19 Jun 2008 23:01:31 +0200 writes:
    KM> I'm testing R version 2.7.0 on windows and there seems
    KM> to be a compatibility issue with objects that were
    KM> created by "approxfun" in older versions. As long as the
    KM> objects were created in version 2.7.0 things work ok,
    KM> but calling the interpolated functions from R version
    KM> 2.0.1 causes this error:

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

    KM> What's the problem and how can t be resolved (need to be
    KM> compatible with old data)?

approxfun() wa moved from "base" to "stats".

If   f <- approxfun(...)  in R 2.0.1
and you save f , load it in R 2.7.0,
you can do

    body(f)[[2]][["PACKAGE"]] <- "stats"

and then use f(..) in R 2.7.0.

Martin Maechler, ETH Zurich

PS: Do I guess correctly, that you are Swiss?