Query node coordinates
These functions allow to query specific coordinate values from the geometries of the nodes.
node_X() node_Y() node_Z() node_M()
Just as with all query functions in tidygraph, these functions
are meant to be called inside tidygraph verbs such as
mutate or filter, where
the network that is currently being worked on is known and thus not needed
as an argument to the function. If you want to use an algorithm outside of
the tidygraph framework you can use with_graph to
set the context temporarily while the algorithm is being evaluated.
A numeric vector of the same length as the number of nodes in the network.
If a requested coordinate value is not available for a node, NA
will be returned.
library(sf, quietly = TRUE)
library(tidygraph, quietly = TRUE)
# Create a network.
net = as_sfnetwork(roxel)
# Use query function in a filter call.
filtered = net %>%
activate("nodes") %>%
filter(node_X() > 7.54)
oldpar = par(no.readonly = TRUE)
par(mar = c(1,1,1,1))
plot(net, col = "grey")
plot(filtered, col = "red", add = TRUE)
par(oldpar)
# Use query function in a mutate call.
net %>%
activate("nodes") %>%
mutate(X = node_X(), Y = node_Y())Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.