[R] error related to approxfun in R 2.7.0

Martin Maechler maechler at stat.math.ethz.ch
Sat Jun 21 23:37:05 CEST 2008

>>>>> "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?

More information about the R-help mailing list