sc_arc | R Documentation |

Return a label and vertex count of each arc.

sc_arc(x, ...) ## Default S3 method: sc_arc(x, ...) ## S3 method for class 'ARC' sc_arc(x, ...)

`x` |
input object |

`...` |
arguments for methods |

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.

a data frame with only the identities of the shared boundaries (arcs)

sc_arc(minimal_mesh) ARC(minimal_mesh)[["arc"]] 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_")])

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