Open spinkney opened 1 year ago
Exposing these should be easy if you can provide the list of supported signatures
@andrjohns, I don't see a rev version of hypergeometric_3F2
so we probably shouldn't expose that now. I also see that hypergeometric_pFq
has a comment about not being exposed to users but I think it could be useful. What are your thoughts on that?
At the end, I believe we just have hypergeometric_2F1
which is quite a useful function.
A couple of questions for @andrjohns:
complex
arguments? Mathematically, it is able but not sure that is built out.apply_*
to for vectorization so the signatures for hypergeometric_2F1
are
a real or int
b real or int
c real or int
z real or int
reject
and document thisa | arbitrary |
---|---|
b | Must be greater 0 |
c | Must be greater than b if |z| < 1, and c > b + a if z = 1 |
z | |z| <= 1 |
More forum requests: https://discourse.mc-stan.org/t/how-to-use-stan-hypergeometric-2f1-in-stan/33840
These functions are in
stan-math
from from the PRs https://github.com/stan-dev/math/pull/2792 and https://github.com/stan-dev/math/pull/2797.Let's expose them.
There is demand on the forums https://discourse.mc-stan.org/t/gaussian-hypergeometric-function-for-exact-distribution-of-a-correlation/30606/3 https://discourse.mc-stan.org/t/hypergeometric-functions/252 https://discourse.mc-stan.org/t/confluent-hypergeometric-functions-to-estimate-population-size-and-detection-probability-from-spatially-replicated-counts/28758 (1F1 but still...)