Add `min` and `max` rev specializations? good first issue

#3249 opened Oct 22, 2025 by SteveBronder

6

FR: More reshaping functions feature new function good first issue

#3233 opened Sep 10, 2025 by WardBrian

stable log cdfs for normal feature good first issue

#3150 opened Feb 21, 2025 by bob-carpenter

2

Add vectorized variant for functions of complex variable, especially exp good first issue

#3138 opened Jan 9, 2025 by jachymb

4

A log_add_exp function that returns containers feature new function good first issue

#3127 opened Nov 15, 2024 by WardBrian

6

log_mix(container, container) should check first argument is simplex feature good first issue

#3125 opened Nov 14, 2024 by bob-carpenter

1

Add "array[] int, int" signature to infix operators + and - feature good first issue

#3104 opened Sep 18, 2024 by paul-buerkner

2

Add Geometric distribution good first issue distributions Issues that deal with distribution functions: pdf, pmf, cdf

#3098 opened Jul 30, 2024 by jachymb

add sincos function good first issue

#3082 opened Jun 6, 2024 by spinkney

1

bernoulli_rng - add signature `ints bernoulli_rng(real theta)` good first issue distributions Issues that deal with distribution functions: pdf, pmf, cdf

#3044 opened Apr 10, 2024 by mitzimorris

Vectorized logical functions feature new function good first issue

#2925 opened Jul 17, 2023 by jessexknight

3

Convolution in 1D and 2D using fft feature new function good first issue

#2844 opened Nov 3, 2022 by nikunj410

Fix Exponentially modified Gaussian overflows at lambda >= 40 good first issue distributions Issues that deal with distribution functions: pdf, pmf, cdf

#2803 opened Aug 14, 2022 by spinkney

2

allow `array[] int` to add and subtract elementwise an `int` or `array[] int` of the same size feature new function good first issue

#2782 opened Jul 7, 2022 by spinkney

8

wiener_lpdf parameter order code cleanup good first issue

#2781 opened Jul 5, 2022 by CarlyLasagna

2

clean up Doxygen bug code cleanup doc good first issue

#2687 opened Mar 15, 2022 by bob-carpenter

Allowing changing transition matrix for hmm suites feature good first issue

#2678 opened Feb 25, 2022 by charlesm93

2

hmm_hidden_state returns NaN bug good first issue

#2677 opened Feb 25, 2022 by charlesm93

2

to_matrix and to_vector to apply to general containers feature good first issue

#2666 opened Feb 10, 2022 by mike-lawrence

1

Generalized Pareto distribution feature new function good first issue distributions Issues that deal with distribution functions: pdf, pmf, cdf

#2661 opened Feb 1, 2022 by JackCaster

12

Implement missing RNG functions feature good first issue

#2658 opened Jan 14, 2022 by rok-cesnovar

Implement missing `cdf`/`lcdf`/`lccdf` functions for distributions feature good first issue

#2657 opened Jan 14, 2022 by rok-cesnovar

5

[FR] Add order statistics pdf good first issue distributions Issues that deal with distribution functions: pdf, pmf, cdf

#2605 opened Oct 19, 2021 by spinkney

3

unit_vector transform should work with zero-length unconstrained feature code cleanup good first issue

#2569 opened Aug 26, 2021 by bob-carpenter

3

quad_form_diag derivatives feature good first issue

#2565 opened Aug 26, 2021 by spinkney

1

L1 and L2 norms (Euclidean and taxicab lengths) feature good first issue

#2562 opened Aug 23, 2021 by bob-carpenter

8

categorical_* functions don't accept row_vectors (it would be good that they could) good first issue distributions Issues that deal with distribution functions: pdf, pmf, cdf

#2443 opened Jun 1, 2017 by bnicenboim

2

add `cospi()`, `sinpi()`, `tanpi()` good first issue

#2376 opened Feb 18, 2021 by spinkney

1

specialized triangular inverse feature new function good first issue

#1911 opened May 25, 2020 by bob-carpenter

relax type identity between constrained variable and target log density code cleanup good first issue

#1733 opened Feb 21, 2020 by bob-carpenter

add log_Phi_approx function and its complement new function good first issue

#1025 opened Sep 7, 2018 by bob-carpenter

3

Functions in prim/mat/fun that could use custom reverse mode autodiff implementations feature good first issue

#989 opened Aug 15, 2018 by bbbales2

7

matrix to array-of-vectors and vice-versa feature new function good first issue

#669 opened Nov 2, 2017 by bob-carpenter

10

convert std::stringstream message use to one-liners code cleanup good first issue

#590 opened Jul 29, 2017 by bob-carpenter

8

tensor product feature new function good first issue

#543 opened May 2, 2017 by bob-carpenter

5

sample mean, covariance, and correlation functions feature new function good first issue

#75 opened Jul 6, 2015 by syclik

5

censored weibull function feature new function good first issue

#57 opened Jul 6, 2015 by syclik

1

Incorrect behaviour of CCDFs when there is a negative random variable bug good first issue

#56 opened Jul 6, 2015 by syclik

15

error_handling: create error handling functions feature new function good first issue

#50 opened Jul 6, 2015 by syclik

13

Log Riemann Zeta plus Zipf distribution feature new function good first issue distributions Issues that deal with distribution functions: pdf, pmf, cdf

#28 opened Jul 6, 2015 by syclik

3