From thierry.onkelinx at inbo.be  Mon May  4 17:10:30 2015
From: thierry.onkelinx at inbo.be (Thierry Onkelinx)
Date: Mon, 4 May 2015 17:10:30 +0200
Subject: [Rd] Problem with adding slots to S4 object
Message-ID: <CAJuCY5xcMALnB6tLnMXoeTjsCrCDhkxy508ad+f+AX5Lr1amtA@mail.gmail.com>

Dear all,

I'm trying to create a virtual S4 class with some subclasses. I noticed
that adding slots to this class increases the memory use and slows the
functions down. Note that I'm adding very small slots (integer or character
both of length 1).

I've made a reproducible example at
https://github.com/ThierryO/testvirtualclass. The R CMD check --as-cran
fails on the tests.

Some of the output of R CMD check

* using R version 3.2.0 (2015-04-16)
* using platform: i386-w64-mingw32 (32-bit)
* using session charset: ISO8859-1
* using option '--as-cran'
* checking tests ...
  Running 'testthat.R' [125s]
 ERROR
Running the tests in 'tests/testthat.R' failed.
Last 13 lines of output:
  Execution halted
  Error: C stack usage  16583636 is too close to the limit

at that point R crashes and uses about 3.7 GB RAM

Any ideas on what is going wrong? Am I using the virual classes in the
wrong way?

Best regards,

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

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[Rd] Problem with adding slots to S4 object
Thierry Onkelinx