Return a label and vertex count of each arc.
sc_arc(x, ...)
# S3 method for default
sc_arc(x, ...)
# S3 method for ARC
sc_arc(x, ...)Arguments
- x
input object
- ...
arguments for methods
Value
a data frame with only the identities of the shared boundaries (arcs)
Details
Arcs are unbranched paths within the line segment graph. Nodes are the vertices where three or more arcs meet.
As with the PATH and SC models the arc id values will only be relevant when
those entities are identified and labelled. Running sc_arc on a simple features model (for example) will
identify them and return a summary, but without having any record of what they refer to. Use ARC(x) first to
work with models that don't included labels.
Examples
sc_arc(minimal_mesh)
#> # A tibble: 4 × 2
#> arc_ ncoords_
#> <chr> <int>
#> 1 CIPVdL 6
#> 2 Mw0gvC 4
#> 3 WbMW8H 4
#> 4 uHdoAI 7
ARC(minimal_mesh)[["arc"]]
#> NULL
arc <- ARC(minimal_mesh)
plot(arc)
points(arc$vertex[match(sc_node(arc)$vertex_, arc$vertex$vertex_), c("x_", "y_")])
arc <- ARC(polymesh)
plot(arc)
title("arcs and nodes")
points(arc$vertex[match(sc_node(arc)$vertex_, arc$vertex$vertex_), c("x_", "y_")])
