Issues

• JSON reader misreads a complex value inside an array of tuples

  bugi/o
  stan-dev/stan#3437 · Filter by author jgabry opened on Sep 23, 2026
  3

• User defined gradients

  stan-dev/stan#3432 · Filter by author avehtari opened on Sep 11, 2026
  9

• Newton optimizer produces NaN parameters for a target with a flat direction, no error raised

  stan-dev/stan#3425 · Filter by author sims1253 opened on Sep 2, 2026
  2

• Improve allocation behavior in NUTS

  algorithmcode cleanuphelp wanted
  stan-dev/stan#3414 · Filter by author WardBrian opened on Aug 24, 2026
  1

• Include (unconstrained) parameter names along with the inverse metric?

  good first issuei/ointerface
  Feature

  stan-dev/stan#3398 · Filter by author jgabry opened on Jul 21, 2026
  4

• base_nuts.hpp:110 — Unnecessary .transpose() on column vector

  stan-dev/stan#3381 · Filter by author ghost opened on Apr 17, 2026

• Additional services missing timing information in csv

  stan-dev/stan#3376 · Filter by author WardBrian opened on Apr 9, 2026

• Lift the "(Transformed) parameters cannot be integers" restriction

  stan-dev/stan#3363 · Filter by author nsiccha opened on Oct 10, 2025
  5

• ODE solvers unnecessarily disallow initial_time == times[1]

  stan-dev/stan#3360 · Filter by author nsiccha opened on Oct 8, 2025

• write transformed data along with posterior sample

  featurei/ointerface
  stan-dev/stan#3349 · Filter by author bob-carpenter opened on Jun 16, 2025
  2

• Services/algorithms: Additional structured_writer for timing information

  i/ointerface
  stan-dev/stan#3340 · Filter by author WardBrian opened on Mar 21, 2025

• Feature request: Add timestamps to sample progress

  stan-dev/stan#3339 · Filter by author jerome-white opened on Mar 12, 2025
  8

• Feature request: Can we have a more compact output formats than CSV such as Parquet?

  i/o
  stan-dev/stan#3332 · Filter by author jachymb opened on Feb 17, 2025
  1

• Improve error messaging at: Error evaluating initial BFGS point.

  stan-dev/stan#3327 · Filter by author jachymb opened on Jan 17, 2025
  3

• FEATURE REQUEST: Can we have native support for ragged arrays?

  stan-dev/stan#3326 · Filter by author jachymb opened on Jan 8, 2025
  4

• ADVI: Option to save family parameters to JSON

  i/ointerface
  stan-dev/stan#3315 · Filter by author WardBrian opened on Nov 18, 2024

• Modify the opitimization line search to not return a point with non-finite gradient

  stan-dev/stan#3306 · Filter by author avehtari opened on Jul 31, 2024
  1

  

• Add boolean-based indexing (e.g., Y[Z == 1])

  stan-dev/stan#3300 · Filter by author andrjohns opened on Jul 16, 2024
  11

• Review the Issues list please?

  stan-dev/stan#3297 · Filter by author MakerPact opened on Jun 30, 2024
  2

• FR: model_base methods - use Eigen::Ref<Eigen::VectorXd>

  stan-dev/stan#3289 · Filter by author andrjohns opened on May 23, 2024

• report condition number of metric for HMC adaptive samplers

  new function
  stan-dev/stan#3280 · Filter by author mitzimorris opened on Apr 15, 2024
  4

• Move from int to long int?

  i/o
  stan-dev/stan#3277 · Filter by author SteveBronder opened on Apr 1, 2024
  3

• Too loose ASSERT_NEAR and wrong test values in compute_potential_scale_reduction_test.cpp

  stan-dev/stan#3273 · Filter by author aleksgorica opened on Feb 26, 2024
  3

• install-tbb.bat fails on windows

  stan-dev/stan#3245 · Filter by author fisher-j opened on Dec 2, 2023

• Print statements inside a model are buffered into a stringstream and only printed when log_prob returns

  stan-dev/stan#3233 · Filter by author WardBrian opened on Oct 4, 2023