0.4.4

[0.4.4] - 2026-10-14

Changed

• Every routine follows the Fortran 90 line by line, including the order of
  the argument checks, so some invalid inputs (e.g., a parameter of −∞)
  report a different error.

• The integer quantile of the discrete distributions brackets the answer by
  doubling.

• Error messages are more descriptive and print floating-point values in
  short form.

Improved

• Fortran 90 reference tables for every kernel, regime, error exit, cdf*
  call and status, and for the iteration traces of dinvr and dzror;
  tests/regenerate/coverage.sh checks that they execute every reachable
  line of cdflib.f90, and tests/regenerate/rust_branch_coverage.sh that
  they take both sides of every branch of the port except those listed with
  a reason.

• The code comments reproduce the Fortran 90 comments verbatim.

• The documentation states the behavior at NaN, infinite and endpoint
  arguments, the tolerances of the searches, and the precision limits of
  the noncentral distributions and of the closed-form densities and masses.

• CI also runs Miri, the tests with the MSRV, semver checks, the Fortran
  coverage check, and the regeneration of the reference tables.

Fixed

• The reference is the current upstream cdflib.f90, which calls
  gamma_user instead of the intrinsic Γ (fixed upstream after our report).
  The port reproduces every reference table bit for bit, in debug and
  release builds, on macOS on Apple silicon.

• Inputs on which the Fortran loops forever return NaN or an error, and the
  noncentral distributions panic where the Fortran integers would overflow.

• Constructors and searches reject parameters on which the Fortran returns
  meaningless values, and several inputs no longer panic.

• cdf, ccdf and the inverses are exact at the ends of the support, and
  a NaN argument gives NaN.

• Densities, masses, moments and entropies no longer overflow, underflow or
  lose precision for extreme parameters.

• try_gamma reports Underflow instead of Overflow below about −171.6.

0.4.3

[0.4.3] - 2026-06-11

Improved

• Lower tolerance margins, closer code, more Fortran 90 tests.

0.4.2

[0.4.2] - 2026-05-24

Improved

• More tests.

• Cleaned up code.

0.4.1

[0.4.1] - 2026-05-21

Changed

• A few further exact alignment to Fortran 90 code.

0.4.0

[0.4.0] - 2026-05-21

New

• try_new constructors return errors on wrong parameters,
  new constructors panic.

• const getters.

Changed

• Error diagnostics has been made uniform.

• NegativeBinomial::solve_trials -> NegativeBinomial::solve_r.

• cdflib::special::GammaError -> cdflib::special::GammaDomainError
  to avoid clash with cdflib::GammaError.

• distribution module was renamed dist.

• Lowered MSRV to 1.71 and switched to Rust 2021 edition.

• Shortened names of error variants.

• inverse_sf is no longer a trait method.

• "Survival function" -> "Complementary cumulative distribution function".

Fixed

• Fixed erratic behavior at endpoints 0 and 1.

• Restored accuracy selection for gamma_inc via gamma_inc_with_acc.

• Solvers now take P and Q instead of computing Q = 1 - P.

0.3.1

[0.3.1] - 2026-05-20

Fixed

• Examples about statrs were not correct.

0.3.0

[0.3.0] - 2026-05-20

Changed

• Major API surface change: fallible functions get try_ prefix, and
  infallible variants panic. There are no longer silent errors returned as
  special values.

0.2.0

Change Log

[0.2.0] - 2026-05-20

Changed

• gamma_x (the Γ function) has been renamed gamma.

0.1.1

[0.1.1] - 2026-05-20

Fixed

• Fixed repo name and a few mathematical typos.

0.1.0

[0.1.0] - 2026-05-19

New

• Initial release.