archeofrag (version 1.2.0)

make_crsr_graph: Makes a "connection" relationships graph including the "similarity" relationships.

Description

Takes a frag.object in argument and returns an undirected graph representing the relationships between archaeological fragments. "Connection" and "similiarity" relationships are combined. A "connection" relationship refers to a physical connection between two fragments that were part of the same object. A "similarity" relationship between fragments is defined if there is an acceptable likelihood that those fragments were part of the same object.

Usage

make_crsr_graph(object)

Value

An undirected "igraph" class graph.

Arguments

object

A frag.object.

Author

Sebastien Plutniak <sebastien.plutniak at posteo.net>

Details

A complementary function to the make_cr_graph function. This function handles both the "connection" and "similarity" relationships. This can be useful, given that "similarity" relations are more frequently documented in archaeological datasets than the "connection" relationships.

The function returns an undirected graph of "igraph" class, using the "fragments" data frame of the frag.object to set the vertices attributes.

Both "connection" and "similarity" relationships are included in the resulting graph. The edge attribute "type_relation" is set with a character "cr" value for "connection" relationships and with "sr" for "similarity" relationships. Edge weights are not set by this function, and it is recommended to use the frag.edges.weighting function. A "frag_type" graph attribute is set with a "connection and similarity" value.

See Also

make_frag_object, make_cr_graph, make_sr_graph

Examples

cr.df <- matrix(c(1,2, 1,3, 2,3, 4,5, 4,6, 7,8), ncol=2, byrow=TRUE)
sr.df <- matrix( c(1,1, 9,1, 10,1, 11,2, 12,2, 13,2), ncol=2, byrow=TRUE)
fragments.df <- data.frame(1:13, letters[1:13]) 
crsr_g <- make_frag_object(cr=cr.df, sr=sr.df, fragments=fragments.df)
make_crsr_graph(crsr_g)