@stdlib/utils-compact-adjacency-matrix

CompactAdjacencyMatrix

Compact adjacency matrix constructor.

Installation

npm install @stdlib/utils-compact-adjacency-matrix

Usage

var CompactAdjacencyMatrix = require( '@stdlib/utils-compact-adjacency-matrix' );

CompactAdjacencyMatrix( N )

Returns a compact adjacency matrix instance.

var adj = new CompactAdjacencyMatrix( 4 );
// returns <CompactAdjacencyMatrix>

// ...

adj.addEdge( 0, 1 );
adj.addEdge( 0, 2 );
adj.addEdge( 1, 2 );
adj.addEdge( 2, 3 );

Examples

var noop = require( '@stdlib/utils-compact-adjacency-matrix' );

// Create a new adjacency matrix:
var adj = new CompactAdjacencyMatrix( 4 );

// Add edges:
adj.addEdge( 1, 0 );
adj.addEdge( 1, 2 );
adj.addEdge( 0, 2 );
adj.addEdge( 2, 3 );

// Compute the indegrees and outdegrees for each vertex:
var id;
var od;
var i;
for ( i = 0; i < 4; i++ ) {
    id = adj.inDegree( i );
    od = adj.outDegree( i );
    console.log( 'vertex: %d. indegree: %d. outdegree: %d.', i, id, od );
}

// Print the list of all edges:
console.log( adj.edges );
// => [ [ 0, 2 ], [ 1, 0 ], [ 1, 2 ], [ 2, 3 ] ]

// Convert the adjacency matrix to an adjacency list representation:
console.log( adj.toAdjacencyList() );
// => [ [ 2 ], [ 0, 2 ], [ 3 ], [] ]

// Compute a topological ordering:
console.log( adj.toposort() );
// => [ [ 1, 0, 2, 3 ], null ]

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Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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License

See LICENSE.

Copyright

Copyright © 2016-2021. The Stdlib Authors.