[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Help-gsl] Gauss hypergeometric function : gsl_sf_hyperg_2F1 gives u
Re: [Help-gsl] Gauss hypergeometric function : gsl_sf_hyperg_2F1 gives up (GSL_EUNIMPL)
Mon, 3 Apr 2017 15:44:58 -0600
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0
Hello, thanks for your report. I have logged the issue into the bug
tracker, but unfortunately it may be some time before I or someone can
look at this - I am not an expert on the hypergeometric functions. If
you happen to investigate further and find a fix I would be happy to
On 02/19/2017 06:02 AM, Mohammad Alaggan wrote:
I am trying to compute the following function:
for non-negative integers i, j, and n, and real x in (0, 1). In particular, n is at
least 1 and is usually below 20, and i, j <= n. To help get a result I use the
symmetry j = n - j, i = n - i, when j < i.
However, the function refuses to compute a result when n = 14 (the case I tried.
It probably would do the same for n > 10). I am using GSL 2.2.1 and the line
producing the error is 773 in the file hyperg_2F1.c. The comment there says « We
give up » . On the other hand, Mathematica can successfully compute the value as
shown in the example below.
Example inputs (with associated Mathematica output):
gsl_sf_hyperg_2F1(-1, -13, 1, 0.651439) = 9.46871
gsl_sf_hyperg_2F1(0 , -11, 4, 0.651439) = 1
I am using this function to compute the transition probability between n
states, and n may be as large as 20.
Inria Lyon, France
|[Prev in Thread]
||[Next in Thread]|
- Re: [Help-gsl] Gauss hypergeometric function : gsl_sf_hyperg_2F1 gives up (GSL_EUNIMPL),
Patrick Alken <=