v2.36.0 (10 December 2024)

• Added de/serialization for the stochastic_row_matrix and stochastic_column_matrix types. (#3298, #3304)
• Added de/serialization for the sum_to_zero_vector type. (#3308)
• Relaxed restrictions on HMC to allow running when a model has no parameters. (#3071, #3303)
• Updated rvalue() functions that use multi_index to return an Eigen expression of multi indexing instead of eagerly creating a new matrix from the indices. (#3250)
• Improved error messages when user-specified initializations fail. (#3291)
• Fixed progress output formatting being inconsistent for the non-adaptive samplers. (#3296)
• Improved parsing of Stan CSV files to allow for getting MCMC sample from fixed_param and samples with saved warmup draws and to be able to correctly get ADVI sample. (#3311)
• Improved parsing of Stan CSV files when they contain nan or infinite values. (#3318)
• Added a new stan::mcmc::chainset object, exposing split-Rhat, split-ESS and Monte Carlo standard error diagnostics. This replaces the chains<> object. (#3312, #3313)
• Fixed a header include order issue that caused compilation with -DSTAN_MODEL_FVAR_VAR to fail for certain models. (#3294)
• Removed support for adding makefile variables in ~/.config/stan/make.local. Use the make/local file in the Stan directory instead. (#3295)