I had an obscure bug that boiled down to this ``feature'' in R,
Read 3921 items
> A = list(aa = 1)
> A
$aa
[1] 1
> if (A$a) print("a is there")
[1] "a is there"
The test appear to check is A$a is TRUE, but what happen is that it
auto-complete (silently), and expand to 'A$aa'.
The problem was caused by the fact that I had also a element named 'a'
which was evaluated to NULL, like
> A$a = NULL
> A
$aa
[1] 1
> if (A$a) print("a is there")
[1] "a is there"
since NULL elements are removed from the list, and that A$a auto-expand
to A$aa, my error appeared.
To me, this seems not a feature I want in order to have a robust
program.
Is there any option to turn this ''feature'' off?
Best,
H
--
Håvard Rue
Department of Mathematical Sciences
Norwegian University of Science and Technology
N-7491 Trondheim, Norway
Voice: +47-7359-3533 URL : http://www.math.ntnu.no/~hrue
Fax : +47-7359-3524 Email: havard....@math.ntnu.no
This message was created in a Microsoft-free computing environment.
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