Thank you, Mr Hosking,
yes, this is a buglet.
I had started to fix this (and similar cases)
-- using a C Macro based approach in src/nmath/dpq.h --
For this reason, the fix will probably only appear in R-devel
i.e., from R-2.2.0 on, and not yet in [R 2.1.1]-patched.
Regards,
Martin Maechler, ETH Zurich
>>>>> "J" == J Hosking <[EMAIL PROTECTED]>
>>>>> on Sat, 09 Jul 2005 15:27:00 -0400 writes:
>> qgamma(1,1.1)
J> [1] Inf
J> as expected. But for shape parameter between 0.16 and 1:
>> qgamma(1,.5)
J> [1] NaN
J> Warning message:
J> NaNs produced in: qgamma(p, shape, scale, lower.tail, log.p)
J> and for shape parameter 0.16 or less:
>> qgamma(1,.1)
J> [1] 99.42507
J> Arguments close to 1 give approximately correct results:
>> qgamma(1-1e-15,.5)
J> [1] 32.05055
>> qgamma(1-1e-15,.1)
J> [1] 28.8129
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