variable_node

Julia

struct VariableNode
VariableNode(name::String, kind::String, units::Union{Nothing, String}, system::String)
VariableNode(name, kind, units, system)

Variable-level node for expression graphs.

Source

TypeScript

interface VariableNode {
    name: string;
    kind: 'state' | 'algebraic' | 'parameter' | 'observed' | 'brownian' | 'discrete' | 'species';
    units?: string;
    system: string;
}

Graph node representing a variable/parameter/species in the system

Properties

• name — Unique identifier for this variable (scoped, e.g., “Transport.temperature”)

• kind — The variable’s DERIVED category (esm-spec §6.3.1), not its declared type. The format declares only unknown and parameter; these are the finer categories a consumer of the graph actually wants, recovered from the equations and from each parameter’s distribution / update.

  state is an ODE state, observed an unknown some equation DEFINES (its LHS naming it, bare or indexed), algebraic one that is only implicitly CONSTRAINED (no equation names it on its LHS), brownian a wiener-updated parameter, discrete a parameter with any other update, parameter a sampled or constant one, and species a reaction-system species.

• units — Units if specified

• system — System/component this variable belongs to

Source

Python

class VariableNode
VariableNode(name: str, kind: str, units: str | None = None, system: str = DEFAULT_SYSTEM)

A variable, parameter or species in the expression graph.

Source

Rust

pub struct VariableNode {
    pub name: String,
    pub kind: VariableKind,
    pub units: Option<String>,
    pub system: String,
}

Node representing a variable in an expression graph

Source · Rust docs

Go

type VariableNode struct {
	// Name is the node's identity: the SCOPED name within the graph
	// ("Component.variable", "Component.Sub.variable"), or the bare name when
	// the owning system is the synthetic "default" scope — i.e. when a bare
	// Model / ReactionSystem / Equation / Reaction / Expr was graphed directly.
	Name string `json:"name"`
	// Kind is one of the NodeKind* graph kinds above.
	Kind   string  `json:"kind"`
	Units  *string `json:"units,omitempty"`
	System string  `json:"system"`
}

VariableNode represents a node in the expression graph

Source · Go docs