project_point_onto_graph: Project data points on the precipal graph

In Albluca/ElPiGraph.R: Elastic principal graph construction

Description

Project data points on the precipal graph

Usage

project_point_onto_graph(X, NodePositions, Edges, Partition = NULL)

Arguments

X	numerical matrix containg points on the rows and dimensions on the columns
NodePositions	numerical matrix containg the positions of the nodes on the rows (must have the same dimensionality of X)
Edges	a 2-dimensional matrix containing edges as pairs of integers. The integers much match the rows of NodePositions
Partition	a Partition vector associating points to at most one of the nodes of the graph. It can be NULL, in which case it will be computed by the algorithm

Value

A list with several elements:

• "X_projected "A matrix containing the projection of the points (on rows) on the edges of the graph

• "MSEP "The mean squared error (distance) of the points from the graph

• "ProjectionValues "The normalized position of the point on its associted edge. A value <0 indicates a projection before the initial position of the node. A value >1 indicates a projection after the final position of the node. A value betwen 0 and 1 indicates at which percentage of the edge length the point is being projected, e.g., a value of 0.3 indicates the 30%.

• "EdgeID "An integer indicating the id of the edge on which each point has been projected. Note that if a point is projected on a node, this id will indicate one of the edges connected to that node.

• "EdgeLen "The length of the edges described by the Edges input matrix

• "NodePositions "the NodePositions input matrix

• "Edges "the Edges input matrix

Albluca/ElPiGraph.R documentation built on May 28, 2019, 11:02 a.m.