This is a Kotlin Multiplatform line-by-line transliteration port of rand_distr.

Original Project: This port is based on rand_distr. All design credit and project intent belong to the upstream authors; this repository is a faithful port to Kotlin Multiplatform with no behavioural changes intended.

This is an in-progress port. The goal is feature parity with the upstream Rust crate while providing a native Kotlin Multiplatform API. Every Kotlin file carries a // port-lint: source <path> header naming its upstream Rust counterpart so the AST-distance tool can track provenance.

The text below is reproduced from https://github.com/rust-random/rand. It is the upstream project's own description and remains under the upstream authors' authorship; links have been rewritten to absolute upstream URLs where appropriate so they continue to resolve from this repository.

Implements a full suite of random number distribution sampling routines.

This crate is a superset of the rand::distr module, including support for sampling from Beta, Binomial, Cauchy, ChiSquared, Dirichlet, Exponential, FisherF, Gamma, Geometric, Hypergeometric, InverseGaussian, LogNormal, Normal, Pareto, PERT, Poisson, StudentT, Triangular and Weibull distributions. Sampling from the unit ball, unit circle, unit disc and unit sphere surfaces is also supported.

It is worth mentioning the statrs crate which provides similar functionality along with various support functions, including PDF and CDF computation. In contrast, this rand_distr crate focuses on sampling from distributions.

The floating point functions from num_traits and libm are used to support no_std environments and ensure reproducibility. If the floating point functions from std are preferred, which may provide better accuracy and performance but may produce different random values, the std_math feature can be enabled. (Note that any other crate depending on num-traits with the std feature (default-enabled) will have the same effect.)

• std (enabled by default): rand_distr implements the Error trait for its error types. Implies alloc and rand/std.
• alloc (enabled by default): required for some distributions when not using std (in particular, Dirichlet and WeightedAliasIndex).
• std_math: see above on portability and libm
• serde: implement (de)seriaialization using serde

• API documentation (docs.rs)
• Changelog
• The Rand project

• All closed Issues and merged Pull requests from before 5.February.2025 (version 0.5.0) can be found in the rand repository where this crate used to be.

rand_distr is distributed under the terms of both the MIT license and the Apache License (Version 2.0).

See LICENSE-APACHE and LICENSE-MIT, and COPYRIGHT for details.

dependencies {
    implementation("io.github.kotlinmania:rand-distr-kotlin:0.1.0")
}

./gradlew build
./gradlew test

• macOS arm64
• Linux x64
• Windows mingw-x64
• iOS arm64 / simulator-arm64 (Swift export + XCFramework)
• JS (browser + Node.js)
• Wasm-JS (browser + Node.js)
• Android (API 24+)

See AGENTS.md and CLAUDE.md for translator discipline, port-lint header convention, and Rust → Kotlin idiom mapping.

This Kotlin port is distributed under the same license terms as the upstream rand_distr. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.

Original work copyrighted by the rand_distr authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.

Thanks to the rand_distr maintainers and contributors for the original Rust implementation. This port reproduces their work in Kotlin Multiplatform; bug reports about upstream design or behavior should go to the upstream repository.