sf_attr {sfnetworks}

Query sf attributes from the active element of a sfnetwork

Description

Query sf attributes from the active element of a sfnetwork

Usage

sf_attr(x, name, active = NULL)

Arguments

x

An object of class sfnetwork.

name

Name of the attribute to query. Either 'sf_column' or 'agr'.

active

Which network element (i.e. nodes or edges) to activate before extracting. If NULL, it will be set to the current active element of the given network. Defaults to NULL.

Details

sf attributes include sf_column (the name of the sf column) and agr (the attribute-geometry-relationships).

Value

The value of the attribute matched, or NULL if no exact match is found.

Examples

net = as_sfnetwork(roxel)
sf_attr(net, "agr", active = "edges")
sf_attr(net, "sf_column", active = "nodes")