Issues

• macOS default tbbmalloc_proxy can crash embedding hosts during foreign-pointer ownership checks

  build
  Bug

  stan-dev/math#3425 · Filter by author nsiccha opened on Sep 30, 2026
  1

  

• All make_partials_propagator to return its input args as a tuple

  code cleanupdistributionsperformance
  Feature

  stan-dev/math#3423 · Filter by author SteveBronder opened on Sep 29, 2026

• Use Eigen::BlockSparseMatrix in Embedded Laplace approximation internals

  code cleanupperformance
  stan-dev/math#3422 · Filter by author SteveBronder opened on Sep 28, 2026

• Add check_foreach(...) function that does multiple checks at once on an array or matrix

  code cleanupnew function
  Feature

  stan-dev/math#3417 · Filter by author SteveBronder opened on Sep 25, 2026

• Inconsistent arena_matrix/varmat interaction between = and +=

  stan-dev/math#3407 · Filter by author andrjohns opened on Sep 19, 2026
  2

  

• Add erfcx (scaled complementary error function) as a Stan Math primitive

  stan-dev/math#3401 · Filter by author avehtari opened on Sep 15, 2026
  3

• Add Luupanov/Sylvester solver

  featurenew function
  Feature

  stan-dev/math#3396 · Filter by author SteveBronder opened on Sep 9, 2026

• integrate_1d_gauss_kronrod gradient computation can be very slow

  stan-dev/math#3392 · Filter by author avehtari opened on Sep 6, 2026
  11

• gaussian_dlm_obs_lpdf returns NaN instead of rejecting when the innovation variance collapses after time zero

  stan-dev/math#3381 · Filter by author sims1253 opened on Aug 31, 2026

• lccdf of beta overflows at reasonably normal values

  stan-dev/math#3377 · Filter by author aakhmetz opened on Aug 28, 2026
  1

  

• Add doubly stochastic matrix constraint

  feature
  stan-dev/math#3372 · Filter by author WardBrian opened on Aug 24, 2026
  1

• add functionality to interpolate in look-up tables

  featurenew function
  stan-dev/math#3365 · Filter by author bmelinden opened on Aug 21, 2026
  11

  

• Derive log CDF and log CCDF of transformed distributions from std_log_lcdf

  stan-dev/math#3364 · Filter by author jaburgoyne opened on Aug 21, 2026

• Add ITP one dimensional solver

  featuregood first issuenew function
  Feature

  stan-dev/math#3362 · Filter by author spinkney opened on Aug 21, 2026
  1

• Feature request: row_centred_matrix and column_centred_matrix

  featuregood first issue
  stan-dev/math#3361 · Filter by author jaburgoyne opened on Aug 18, 2026
  3

• add is_even and is_odd here and to Stan

  good first issuenew function
  stan-dev/math#3349 · Filter by author bob-carpenter opened on Jul 20, 2026

• Scans and reduction functions

  featurenew function
  stan-dev/math#3340 · Filter by author WardBrian opened on Jun 30, 2026
  1

• wiener_lpdf full model returns -inf for valid-support inputs in variability branches

  stan-dev/math#3329 · Filter by author martonaronvarga opened on Jun 4, 2026
  2

• Redundant function multiply_log vs. lmultiply

  stan-dev/math#3318 · Filter by author jachymb opened on May 10, 2026
  1

• Laplace tests taking too long in develop Jenkins runs

  continuous integration
  stan-dev/math#3309 · Filter by author WardBrian opened on Apr 21, 2026
  2

• Continuous modified second kind Bessel function

  stan-dev/math#3306 · Filter by author currocam opened on Apr 20, 2026
  7

• Feature request: permit location of 0/negative_infinity() in neg_binomial_2(_log)_lpmf

  distributionsgood first issuenumerics
  stan-dev/math#3302 · Filter by author mhollanders opened on Apr 13, 2026
  3

• Add low-rank multivariate normal distribution

  stan-dev/math#3288 · Filter by author lingium opened on Feb 24, 2026

• Reuse direct reverse mode autodiff specializations for known laplace distributions

  stan-dev/math#3287 · Filter by author SteveBronder opened on Feb 23, 2026
  1

• Matrix comprehensions (build_matrix function)

  featurenew function
  stan-dev/math#3282 · Filter by author WardBrian opened on Feb 12, 2026
  6