Nothing
library(stplanr)
library(sf)
library(igraph)
# Create the network structure
routes <- st_sf(
ID_from = c(101, 102, 103, 104, 101),
ID_to = c(102, 103, 104, 101, 103),
ID_edge = 1:5,
distance = c(2.1, 1, 1.5, 2.5, 10),
geometry = st_sfc(
st_linestring(rbind(c(1, 3), c(3, 3))),
st_linestring(rbind(c(3, 3), c(3, 2))),
st_linestring(rbind(c(3, 2), c(2, 1))),
st_linestring(rbind(c(2, 1), c(1, 3))),
st_linestring(rbind(c(1, 3), c(3, 2)))
)
)
sln <- SpatialLinesNetwork(routes)
plot(sln)
V(sln@g)$name <- as.character(101:104)
# shortest path
(shortest <- sum_network_routes(sln = sln,
start = "101", end = "103",
sumvars = c("length")))
plot(st_geometry(sln@sl))
plot(st_geometry(shortest), add = TRUE, col = "red", lwd = 2)
# E(sln@g)$weight <- routes$distance
# sln@sl$length <- routes$distance
weightfield(sln) <- "distance"
(most_efficient <- sum_network_routes(sln = sln,
start = 1, end = 3,
sumvars = c("length")))
plot(st_geometry(shortest), add = TRUE, col = "red", lwd = 2)
plot(st_geometry(most_efficient), add = TRUE, col = "blue", lwd = 2)
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