stan-dev/math

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The Stan Math Library is a C++ template library for automatic differentiation of any order using forward, reverse, and mixed modes. It includes a range of built-in functions for probabilistic modeling, linear algebra, and equation solving.

Stars: 839
Forks: 220
Open beginner issues: 0
Indexed issues: 272
Avg merge: 2d 4h
Merged PRs (30d): 14

Dominant language: C++
License: BSD-3-Clause
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

Open All

272 open issues indexed

Add "Ratcliff" log-likelihood, Wiener process with intrinsic trial-to-trial drift variability Open

feature new function

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/math#287 · 3 comments · Opened Apr 20, 2016
Include what you use for library and tests Open

code cleanup feature

stan-dev/math#251 · 7 comments · 1 assignee · Opened Mar 3, 2016
distribution variable names in error messages to match manual Open

code cleanup

stan-dev/math#227 · 1 comment · 2 assignees · Opened Feb 9, 2016
truncated PRNGs Open

feature new function

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/math#214 · 14 comments · 1 reaction · Opened Dec 6, 2015
multiple outputs of RNGs Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

stan-dev/math#1746 · 3 comments · Opened Jul 20, 2015
test fixture test_gradients problem Open

bug code cleanup testing

stan-dev/math#102 · 1 comment · 3 assignees · Opened Jul 6, 2015
add skew Student-t distribution Open

distributions feature new function

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/math#100 · 3 reactions · Opened Jul 6, 2015
Analytic evolve functions (ODE) Open

feature

Difficulty 5/5 Over a week Newbie friendliness 30/100

stan-dev/math#95 · 1 comment · Opened Jul 6, 2015
poisson_log cdfs Open

feature new function

Difficulty 3/5 1-2 days Newbie friendliness 30/100

stan-dev/math#90 · 4 comments · Opened Jul 6, 2015
add test for nan derivatives for distribution tests Open

feature testing

stan-dev/math#87 · 2 comments · 1 assignee · Opened Jul 6, 2015
matrix normal distribution Open

feature new function

stan-dev/math#86 · 1 comment · 1 assignee · Opened Jul 6, 2015
for integrate_ode, allow the initial time to be identical to the first time point Open

feature

stan-dev/math#84 · 3 comments · 1 assignee · Opened Jul 6, 2015
sample mean, covariance, and correlation functions Open

feature good first issue new function

stan-dev/math#75 · 5 comments · 1 assignee · Opened Jul 6, 2015
log_mix on the logit scale Open

feature new function

stan-dev/math#69 · 4 comments · 1 assignee · Opened Jul 6, 2015
Kronecker matrix utilities Open

feature new function

stan-dev/math#60 · 6 comments · 1 assignee · Opened Jul 6, 2015
Interpolation function(s) Open

feature new function

Difficulty 5/5 Over a week Newbie friendliness 35/100

stan-dev/math#58 · 7 comments · Opened Jul 6, 2015
censored weibull function Open

feature good first issue new function

Difficulty 3/5 1-2 days Newbie friendliness 35/100

stan-dev/math#57 · 1 comment · Opened Jul 6, 2015
Incorrect behaviour of CCDFs when there is a negative random variable Open

bug good first issue

stan-dev/math#56 · 15 comments · 1 assignee · Opened Jul 6, 2015
error_handling: create error handling functions Open

feature good first issue new function

stan-dev/math#50 · 13 comments · 2 assignees · Opened Jul 6, 2015
(multivariate) normal operating on sufficient statistics Open

feature new function

stan-dev/math#38 · 27 comments · 1 assignee · Opened Jul 6, 2015
Update gaussian_dlm_obs_log to use LDLT Open

code cleanup distributions feature performance

stan-dev/math#30 · 3 comments · 2 assignees · Opened Jul 6, 2015
Log Riemann Zeta plus Zipf distribution Open

distributions feature good first issue new function

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/math#28 · 3 comments · Opened Jul 6, 2015

stan-dev/math

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