Jimmy Lu 74bb4bccf2 Fix inverse_discrete_quantile for large guess (#1007) ...

If `guess` passed to `inverse_discrete_quantile` cannot be represented
as floating point number, it is possible that `guess + 1` or `guess - 1`
does not change the value at all and we are stuck in infinite loop
inside `round_to_floor` or `round_to_ceil`.  Fix this by
increase/decrease more than 1 in these cases.

Example code to reproduce this:
```c++
boost::math::binomial_distribution<> dist(9079765771874083840, 0.561815);
boost::math::quantile(dist, 0.0365346);
```

2023-08-24 08:31:37 -04:00

..

boost

Fix inverse_discrete_quantile for large guess (#1007)

2023-08-24 08:31:37 -04:00