Standard library

Eqiora’s standard library is the Eqiora.* collection of reusable physical components, laws, and boundary conditions. They are ordinary .eqi files in crates/eqiora-api/packages/, so you can import a component, bind its physical inputs, and open its source to read the equations.

Build	Start with	Learn the physics
Resistor networks and voltage sources	Electrical components	Circuits and dynamics
Small-strain solid deformation	Solid components	Structural mechanics
Viscous incompressible flow	Fluid components	Fluid mechanics
Delays and discrete integration	Sampled controls	Decay and storage
Heat conduction and material properties	Local thermal examples	Heat transfer

Install and import a package

After installing Eqiora, create a package directory with eqiora.toml and src/main.eqi. For example:

eqiora.toml

[package]
name = "org.example.Divider"
version = "0.1.0"
entry = "main"

The source imports the desired module:

eqi

import Eqiora.Electrical.Basic.basic as electrical;

Register the bundled dependency, then compile your model by its declaration name:

python

from pathlib import Path
import eqiora

project = Path("divider")
store = Path("package-store")
store.mkdir(exist_ok=True)
resolution = eqiora.add_bundled_dependency(
    project, store, "Eqiora.Electrical.Basic", version="0.1.0"
)
model = eqiora.compile_package(store, resolution, entry="VoltageDivider")

The electrical example has the complete VoltageDivider model and solver setup. add_bundled_dependency adds the dependency to the project, writes the lock, and installs the source into the local store; there is no need to copy library equations into your model.

To bundle a project with its dependencies:

python

vendor = project / "vendor"
vendor.mkdir(exist_ok=True)
eqiora.vendor_project(project, store, vendor)
resolution = eqiora.open_project(project, vendor)
model = eqiora.compile_package(vendor, resolution, entry="VoltageDivider")

To build your own package, follow Create and share a library from directory layout to local imports, GitHub dependencies, and offline use. See project packages for the detailed resolution and update rules.

The bundled names are Eqiora.Electrical.Basic, Eqiora.Controls.Sampled, Eqiora.Mechanics.Interfaces, Eqiora.Solid.LinearElasticity, and Eqiora.Fluid.Incompressible.

Browse the package sources

The repository contains more packages than are bundled. Only the bundled names above work with add_bundled_dependency; the others are here for reading.

Module	Purpose
Electrical.Basic	Pin, ideal voltage source, resistor, ground
Electrical.Circuits	Parallel DC circuit composed from Basic
Electromechanical.DcDrive	Controlled source, permanent-magnet motor, inertial load, speed sensor
Controls.Sampled	Unit delay and discrete integrator on a supplied clock
Solid	Plane-strain and plane-stress elasticity, material properties, solid boundary conditions
Fluid	Steady Stokes flow and velocity, traction, and pressure boundary conditions
Solid.LinearElasticity	Quasistatic and dynamic elastic balances and interfaces
Fluid.Incompressible	Steady 2D and conservative transient 3D Newtonian volume laws and interfaces
Fluid.InertialStokes	Inertial Stokes volume law without velocity advection
Mechanics.Interfaces	Velocity/traction connectors and zero boundary terminals
Mechanics.BoundaryLoads	Normal-pressure traction terminal

Each source file shows the full signatures and equations.

Thermal components and material properties

These examples are local projects you can reuse and adapt:

• Heated body contains steady conduction and constant-capacity transient components, complete boundary and initial data, and a Python runner. Follow the thermal walkthrough.
• Property composition contains a temperature-dependent conductivity table, its attribution, and Fourier-flux and slab-conductance components that share the property. Read the property syntax.

There is no bundled thermal package; resolve these examples as local eqiora.toml projects.