Assuming you are still updating 1.0, this comes from a bug report on
R built with a toolchain from Sept 2010 (but the bug is still present
in the 1.0 branch).
Suppose x is what is called in the C code MAXNUM, the maximum
normalized double. Then pow(x, y) is computed as INF for 0 < y <= 1,
when it should be a perfectly good normalized double. The bug is at
line 382 of pow.c, which has
if (x >= MAXNUM)
{
#if INFINITIES
if (y > 0.0)
return (INFINITY);
#else
if (y > 0.0)
return (MAXNUM);
#endif
return (0.0);
}
It should of course be x > MAXNUM.
There is a similar problem at line 410, which should be x < -MAXNUM .
The code in 2.0 and trunk is completely different, and does these
corner cases correctly.
--
Brian D. Ripley, [email protected]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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