Merci, François!
>>>>> "FrPi" == François Pinard <[EMAIL PROTECTED]>
>>>>> on Tue, 28 Mar 2006 03:00:19 +0200 (CEST) writes:
FrPi> Hi, people. Here is a transcript of a "R --vanilla" session:
FrPi>
======================================================================>
FrPi> R : Copyright 2005, The R Foundation for Statistical Computing
FrPi> Version 2.2.1 (2005-12-20 r36812)
....................
>> z = data.frame(a=0:9, b=10:19)
>> apply(z, 1, sum)
FrPi> 1 2 3 4 5 6 7 8 9 10
FrPi> 10 12 14 16 18 20 22 24 26 28
>> apply(z, 1, '$', 'a')
FrPi> NULL
>> apply(z, 1, sum)
FrPi> Erreur dans sum(..., na.rm = na.rm) : 'mode' de l'argument incorrect
FrPi>
======================================================================<
FrPi> There are three explicit calls to "apply", one would expect the first
FrPi> and the third to yield similar results. They do indeed, if the second
FrPi> "apply" is not executed, or if '$' gets replaced by '[[' within it.
So
FrPi> the second "apply", as written, may be hurting the R interpreter.
Indeed! 'z' itself is not changed; it's something else that's corrupted,
since one can reproduce the bug by
apply(data.frame(a=0:9, b=10:19), 1, sum)
apply(data.frame(a=0:9, b=10:19), 1, "$", "a")
apply(data.frame(a=0:9, b=10:19), 1, sum)
##-> error ... invalid 'mode'
This also happens in "R-devel", since yesterday aka
"2.3.0 alpha".
Martin
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