intact_to_sink: Size of intact network that feeds into the sink or a...

In streamDAG: Analytical Methods for Stream DAGs

Size of intact network that feeds into the sink or a particular node

Description

The length of the subgraph network that ends (feeds into) a particular node, e.g., the sink. For a weighted graph, the sum of the weights of the subgraph are given. Thus, if weights are stream lengths the function will give the stream length of the portion of the intact stream network that feeds into a particular node.

Usage

size.intact.to.sink(G, sink = NULL)

size.intact.to.node(G, node = NULL)

Arguments

G	A graph object of class "igraph", see graph_from_literal
sink	The sink node of G.
node	A node of interest. If node = "all", the index will be computed for all nodes.

Value

Returns the size of the graph or subgraph whose downstream end (outlet) is a node of interest.

Author(s)

Ken Aho, Gabor Csardi wrote several important function components including subgraph.

Examples

# Murphy Cr. disconnected network, no arc from M1799 to M1719!

G <- graph_from_literal(IN_N --+ M1984 --+ M1909, IN_S --+ M1993 --+ M1951, 
M1951 --+ M1909 --+ M1799, M1719 --+ M1653 --+ M1572 --+ M1452 --+ M1377, 
M1377 --+ M1254 --+ M1166 --+ M1121 --+ M1036 --+ M918 --+ M823 --+ M759, 
M759 --+ M716 --+ M624 --+ M523 --+ M454 --+ M380 --+ M233 --+ M153 --+ M91, 
M91 --+ OUT)

data(mur_coords) # coordinate data
spatial.plot(G, mur_coords[,2], mur_coords[,3], names =  mur_coords[,1])

data(mur_lengths) # segment length data 

lengths_new <- mur_lengths[-7,] # Drop M1799 -> M1719 arc length
E(G)$weight <- lengths_new[,2] # units are in meters
size.intact.to.node(G, node = "all") 
size.intact.to.sink(G, sink = "OUT") # same as output below:
size.intact.to.node(G, node = "OUT")

streamDAG documentation built on April 4, 2025, 12:28 a.m.