v5.0.0 (10 December 2024)

Breaking changes:

• Removed deprecated _log() probability functions. (#2995)
• Moved constraint transforms to their own folder. (#3039)
• Updated arena_matrix to use move semantics. (#2928)
• Un-vendored a great many unused boost libraries. (#3129)
• C++17 is now required.

Other changes:

• Added sum_to_zero_constrain, sum_to_zero_free, and check_sum_to_zero. (#3101)
• Added beta_neg_binomial_lpmf. Allows modeling heavy-tail count data. (#3108)
• Added beta_neg_binomial_lccdf. (#3114, #3118)
• Added beta_neg_binomial_lcdf. (#3116)
• Added beta_neg_binomial_cdf. (#3120)
• Added beta_neg_binomial_rng. (#3126)
• Added overloads for tuples of bounds to lub_free and lub_constrain. (#3087)
• Added error checking functions for row/column stochastic matrices. (#3095)
• Added constructor to vari for passing initial values and adjoints. (#3089)
• Improved efficiency of finite_diff_gradient_auto. (#3096)
• Functions concerned with the number of entries in a container (size, cols, rows, ...) now consistently use long int as their return type. (#3086)
• Removed support for adding makefile variables in ~/.config/stan/make.local. Use the make/local file in the Math directory instead. (#3090)
• Fixed an indexing bug inside gp_matern32_cov. (#3084)
• Fixed the new wiener_lpdf overloads evaluating their expression template arguments more than once. (#3112)
• Fixed some failures to compile calls to pow when using libc++ 19. (#3110)
• Updated templated complex functions in the Stan math library to be better candidates than the standard library functions during ADL. (#3122)
• Fixed a warning about a mismatched struct/class declaration from clang 18. (#3091)
• Fixed compilation of fabs with Apple Clang 15. (#3093)
• Fix Eigen issue 2852 so that Eigen's kronecker product type works with value_type_t. (#3124)