pathwayfrom

Pathwayfrom is a term used in graph theory and data analysis to describe an operation that retrieves directed paths originating from a specified starting node within a graph. It is often discussed as a functional concept in discussions of graph traversal, query languages, and workflow composition, rather than as a universally standardized method.

In practice, pathwayfrom denotes a function or operator that, given a graph G = (V, E) and a start node s in V, returns one or more paths that begin with s and follow directed edges to other nodes. Commonly, implementations support optional constraints such as maximum path length, allowed edge types or labels, node filters, and whether cycles are permitted. The result is typically a collection of paths, each represented as a sequence of nodes or edges starting at s (for example, s → v1 → v2 → … → vk).

Operationally, pathwayfrom can be implemented via depth-first search or breadth-first search with pruning based on constraints. Some systems expose pathwayfrom as part of a graph query language, enabling users to specify constraints in a compact form. The concept is especially relevant when exploring networks where the origin of a pathway matters, such as signaling cascades in biology, transportation networks, or dependency graphs.

Applications include tracing starting points in biological pathways, identifying provenance in data workflows, and analyzing origin-based connectivity in social or information networks. Limitations include combinatorial growth of possible paths and the need for careful constraint settings to produce meaningful results.

See also: path, reachability, pathfinding, graph traversal, transitive closure.