R help - Oct 2013 - TR: problem with ecdf : "missing C_R_approxfun" message

Hi again, this is a follow-up of my previous post :

I've noticed that
> attr(first.list[[1]]$size.ecdf,"call")  gives ecdf(test.moms[,
"m.pxs"]) and that there is no "test.moms" field in my
records (a local variable named test.moms was used inside a function, but it was
stored under another name in the list, outside the function)
May this be the answer (and I've been stupid not to see this before !) ?

Anyway, trying to change "test.moms" to the real name of the
corresponding record field, i.e. :
>
attr(first.list[[1]]$size.ecdf,"call")<-ecdf(first.list[[1]]$true.varname[,"m.pxs"])
Does not fix the problem.

Is changing the call attribute the thing to do, but done in a wrong way ?
If yes, what is the "good way" ?
If not, what can be done ?

Thanks again, Olivier


De : Olivier Eterradossi
Envoyé : jeudi 24 octobre 2013 08:54
À : 'r-help@r-project.org'
Objet : problem with ecdf : "missing C_R_approxfun" message

Hi list,

In June 2013, using R.2.15.1 (i386) on Windows 7, I calculated a set of ecdf
which I stored in lists of records having a "size.ecdf" field, with
following structure :

[skip previous structure...]
$ size.ecdf   :function (v)
  ..- attr(*, "class")= chr [1:3] "ecdf" "stepfun"
"function"
  ..- attr(*, "call")=length 2 ecdf(test.moms[, "m.pxs"])
  .. ..- attr(*, "srcref")=Class 'srcref'  atomic [1:8] 12 1
12 36 1 36 12 12
  .. .. .. ..- attr(*, "srcfile")=Classes 'srcfilecopy',
'srcfile' <environment: 0x07d7b3b0>
[skip following structure...]

In September I upgraded to R.3.0.1 under the same OS

I need to use my previously recorded ecdfs again, and try to plot one  as in :
> plot(first.list[[1]]$size.ecdf,col=couleurs[1],main="first ecdf")
Which returns :
Erreur dans x(0.5 * (ti.l + ti.r)) : objet 'C_R_approxfun' introuvable
Sorry it's in French  ;-)  , it translates to "error in x(0.5 * (ti.l +
ti.r)) : missing object 'C_R_approxfun' "

The same message prints when trying to use other ecdf methods, or other records
in my lists.

I first searched the help and archives without success, here are four questions
I cannot answer :

What is this "C_R_approxfun" object and what is it intended to do ?
What may have caused it is missing now (and was not in June) ?
Does this mean that I should have recorded other useful parameters in June (such
as environment parameters) ?
Or anything else I cannot guess ?

Thanks for helping, I'm stuck and I would prefer not to calculate all my
"old" ecdfs again !

Regards, Olivier

--------------------------
Olivier ETERRADOSSI
Maître-Assistant, HDR
Ecole des Mines d'Alès (C2MA, site de Pau)
Ingénierie de l'aspect visuel et tactile des matériaux
Pôle « Recherche sur les Interactions des Matériaux avec leur Environnement »
(RIME)
Hélioparc, 2 av. P. Angot, F-64053 PAU CEDEX 9
Tel : 05 59 30 90 35 (direct) - 05 59 30  54 25 (std)
Fax : 05 59 30 63 68
http://www.mines-ales.fr<http://www.mines-ales.fr/>
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