/// <summary>
/// Utility method, for creating new layer in the multilayer network.
/// </summary>
/// <param name="mnet">Multilayer network.</param>
/// <param name="newLayerName">Name of the new layer.</param>
/// <param name="layers">Layers of the network.</param>
/// <param name="forceDirected">True if new edges should be directed, false if not.</param>
/// <param name="forceActors">True if all actors should be on the new layer, false if not.</param>
/// <returns>Newly created layer.</returns>
private Layer createLayer(MultilayerNetwork mnet, string newLayerName, HashSet <Layer> layers,
bool forceDirected, bool forceActors)
{
var directed = forceDirected;
// Check if there are any directed layers, if YES, then new layer will be directed as well.
if (!directed)
{
foreach (var layer1 in layers)
{
foreach (var layer2 in layers)
{
if (mnet.IsDirected(layer1, layer2))
{
directed = true;
break;
}
}
if (directed)
{
break;
}
}
}
var dir = directed ? EdgeDirectionality.Directed : EdgeDirectionality.Undirected;
var newLayer = mnet.AddLayer(newLayerName, dir);
if (newLayer == null)
{
throw new ArgumentException("Layer " + newLayerName + " already exists.");
}
if (forceActors)
{
foreach (var actor in mnet.GetActors())
{
mnet.AddNode(actor, newLayer);
}
}
else
{
foreach (var layer in layers)
{
foreach (var node in mnet.GetNodes(layer))
{
mnet.AddNode(node.Actor, newLayer);
}
}
}
return(newLayer);
}
/// <summary>
/// Returns density of the layer in the network.
/// </summary>
/// <param name="mnet">Multilayer network model.</param>
/// <param name="layer">Layer to calculate density on.</param>
/// <returns>Density of the given layer.</returns>
public double Density(MultilayerNetwork mnet, Layer layer)
{
// Had to use long, because we will be calculating max. potential connections.
// And integer wasn't enough.
// Get all nodes on the layer.
long nodesCount = mnet.NodesByLayer[layer.Id].Count;
// Get all edges on the layer.
long edgesCount = 0;
// Check if there is this layer.
if (mnet.EdgesByLayerPair.ContainsKey(layer.Id) && mnet.EdgesByLayerPair[layer.Id].ContainsKey(layer.Id))
{
edgesCount = mnet.EdgesByLayerPair[layer.Id][layer.Id].Count;
}
long potentialConnections = 0;
if (mnet.IsDirected(layer, layer))
{
potentialConnections = nodesCount * (nodesCount - 1);
}
else
{
potentialConnections = (nodesCount * (nodesCount - 1)) / 2;
}
long actualConnections = edgesCount;
if (actualConnections == 0)
{
return(0);
}
return((double)actualConnections / potentialConnections);
}
/// <summary>
/// Flatten layers into single layer.
/// </summary>
/// <param name="mnet">Multilayer network.</param>
/// <param name="newLayerName">Name of the new layer.</param>
/// <param name="layers">Layers to flatten.</param>
/// <param name="forceDirected">True if new edges should be directed, false if not.</param>
/// <param name="forceActors">True if all actors should be on the new layer, false if not.</param>
/// <returns>Flattened layer.</returns>
public Layer FlattenUnweighted(MultilayerNetwork mnet, string newLayerName, HashSet <Layer> layers,
bool forceDirected = false, bool forceActors = false)
{
var newLayer = createLayer(mnet, newLayerName, layers, forceDirected, forceActors);
var directed = mnet.IsDirected(newLayer, newLayer);
foreach (var layer1 in layers)
{
foreach (var layer2 in layers)
{
foreach (var edge in mnet.GetEdges(layer1, layer2))
{
var node1 = mnet.GetNode(edge.V1.Actor, newLayer);
var node2 = mnet.GetNode(edge.V2.Actor, newLayer);
var newEdge = mnet.GetEdge(node1, node2);
if (newEdge == null)
{
newEdge = mnet.AddEdge(node1, node2);
}
// If new layer is directed, undirected edges must be added twice in both directions.
if (directed && edge.Directionality == EdgeDirectionality.Undirected)
{
newEdge = mnet.GetEdge(node2, node1);
if (newEdge == null)
{
newEdge = mnet.AddEdge(node2, node1);
}
}
}
}
}
return(newLayer);
}
private IO io = IO.Instance; //new IO();
public void TransformationTest()
{
var transform = new Transformation.Transformation();
Console.WriteLine("Transformation test begin...");
Console.WriteLine("Creating the network...");
var mnet = new MultilayerNetwork("Transformation Test");
var a1 = mnet.AddActor("a1");
var a2 = mnet.AddActor("a2");
var a3 = mnet.AddActor("a3");
var a4 = mnet.AddActor("a4");
var a5 = mnet.AddActor("a5");
var a6 = mnet.AddActor("a6");
var i1 = mnet.AddActor("I1");
var i2 = mnet.AddActor("I2");
var i3 = mnet.AddActor("I3");
var L1 = mnet.AddLayer("People 1", EdgeDirectionality.Undirected);
var L2 = mnet.AddLayer("People 2", EdgeDirectionality.Undirected);
var people = new HashSet <Layer> {
L1, L2
};
var L3 = mnet.AddLayer("Institutions", EdgeDirectionality.Undirected);
var a1l1 = mnet.AddNode(a1, L1);
var a2l1 = mnet.AddNode(a2, L1);
var a3l1 = mnet.AddNode(a3, L1);
var a4l1 = mnet.AddNode(a4, L1);
var a5l1 = mnet.AddNode(a5, L1);
var a1l2 = mnet.AddNode(a1, L2);
var a2l2 = mnet.AddNode(a2, L2);
var a3l2 = mnet.AddNode(a3, L2);
var a4l2 = mnet.AddNode(a4, L2);
var a5l2 = mnet.AddNode(a5, L2);
var i1l3 = mnet.AddNode(i1, L3);
var i2l3 = mnet.AddNode(i2, L3);
var i3l3 = mnet.AddNode(i3, L3);
mnet.AddEdge(a1l1, a2l1);
mnet.AddEdge(a1l1, a3l1);
mnet.AddEdge(a1l2, a2l2);
mnet.AddEdge(a3l2, a4l2);
mnet.AddEdge(a1l2, i1l3);
mnet.AddEdge(a2l2, i1l3);
mnet.AddEdge(a2l2, i2l3);
mnet.AddEdge(a3l2, i2l3);
mnet.AddEdge(a4l2, i2l3);
mnet.AddEdge(a5l2, i3l3);
Console.WriteLine("Creating network end.");
Console.WriteLine("Flattening L1 and L2 (unweighted, only existing actors)...");
var f1 = transform.FlattenUnweighted(mnet, "flattened1", people, false, false);
if (mnet.IsDirected(f1, f1))
{
Console.WriteLine("Layer should be undirected");
}
if (mnet.GetNodes(f1).Count != 5)
{
Console.WriteLine("Wrong number of nodes");
}
if (mnet.GetEdges(f1, f1).Count != 3)
{
Console.WriteLine("Wrong number of edges");
}
Console.WriteLine("Done! " + mnet.ToString());
Console.WriteLine();
Console.WriteLine("Flattening L1 and L2 (unweighted, all actors)...");
var f2 = transform.FlattenUnweighted(mnet, "flattened2", people, false, true);
if (mnet.IsDirected(f2, f2))
{
Console.WriteLine("Layer should be undirected");
}
if (mnet.GetNodes(f2).Count != 9)
{
Console.WriteLine("Wrong number of nodes, {0}\t != {1}", mnet.GetNodes(f2).Count, 9);
}
if (mnet.GetEdges(f2, f2).Count != 3)
{
Console.WriteLine("Wrong number of edges");
}
Console.WriteLine("Done! " + mnet.ToString());
Console.WriteLine();
Console.WriteLine("Transformation test end.");
Console.ReadLine();
}
