On 10/21/2017 04:14 PM, Radford Neal wrote:
On Fri, 2017-10-20 at 14:01 +0000, brodie gaslam via R-devel wrote:
I'm thinking of this passage:
Logical values are sent as 0 (FALSE), 1 (TRUE) or INT_MIN =
-2147483648 (NA, but only if NAOK is true), and the compiled code
should return one of these three values. (Non-zero values other
than INT_MIN are mapped to TRUE.)
The parenthetical seems to suggest that something like 'LOGICAL(x)[0]
= 2;' will be treated as TRUE, which it sometimes is, and sometimes
isn't:
From: Martyn Plummer <plumm...@iarc.fr>
The title of Section 5.2 is "Interface functions .C and .Fortran" and
the text above refers to those interfaces. It explains how logical
vectors are mapped to C integer arrays on entry and back again on exit.
This does work as advertised.
Not always. As I reported on bugzilla three years ago (PR#15878), it
only works if the logical argument does not have to be copied. The
bug has been fixed in pqR since pqR-2014-09-30.
Radford Neal
Thanks, that's indeed a bug - now fixed in 73583.
Tomas
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