Rust reimplementation of PathSim with an identical Python API, JIT compilation, and standalone C code generation.

API GitHub

Key Features

Rust Core
Native Rust engine with an identical PathSim Python API — swap the import
21 Solvers
Explicit, implicit, and adaptive integrators, mirroring pathsim.solvers
JIT + Autodiff
Traces Python functions to Rust IR with symbolic Jacobians
C Code Generation
Generate standalone C from a simulation for embedded deployment
DAE Blocks
Mass-matrix, semi-explicit, and fully-implicit DAE blocks
WebAssembly
Compiles to WASM and runs in the browser via Pyodide

Quick Start

FastSim mirrors the PathSim API — the same block-diagram code runs on the Rust engine by swapping the import.

Example
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