Alias for dodgr_dists
dodgr_distances( graph, from = NULL, to = NULL, shortest = TRUE, pairwise = FALSE, heap = "BHeap", parallel = TRUE, quiet = TRUE )
graph 


from  Vector or matrix of points from which route distances are to be calculated (see Notes) 
to  Vector or matrix of points to which route distances are to be calculated (see Notes) 
shortest  If 
pairwise  If 
heap  Type of heap to use in priority queue. Options include
Fibonacci Heap (default; 
parallel  If 
quiet  If 
square matrix of distances between nodes
# A simple graph graph < data.frame (from = c ("A", "B", "B", "B", "C", "C", "D", "D"), to = c ("B", "A", "C", "D", "B", "D", "C", "A"), d = c (1, 2, 1, 3, 2, 1, 2, 1)) dodgr_dists (graph)#> A B C D #> A 0 1 2 3 #> B 2 0 1 2 #> C 2 2 0 1 #> D 1 2 2 0# A larger example from the included [hampi()] data. graph < weight_streetnet (hampi) from < sample (graph$from_id, size = 100) to < sample (graph$to_id, size = 50) d < dodgr_dists (graph, from = from, to = to) # d is a 100by50 matrix of distances between `from` and `to` if (FALSE) { # a more complex street network example, thanks to @chrijo; see # https://github.com/ATFutures/dodgr/issues/47 xy < rbind (c (7.005994, 51.45774), # limbeckerplatz 1 essen germany c (7.012874, 51.45041)) # hauptbahnhof essen germany xy < data.frame (lon = xy [, 1], lat = xy [, 2]) essen < dodgr_streetnet (pts = xy, expand = 0.2, quiet = FALSE) graph < weight_streetnet (essen, wt_profile = "foot") d < dodgr_dists (graph, from = xy, to = xy) # First reason why this does not work is because the graph has multiple, # disconnected components. table (graph$component) # reduce to largest connected component, which is always number 1 graph < graph [which (graph$component == 1), ] d < dodgr_dists (graph, from = xy, to = xy) # should work, but even then note that table (essen$level) # There are parts of the network on different building levels (because of # shopping malls and the like). These may or may not be connected, so it may # be necessary to filter out particular levels index < which (! (essen$level == "1"  essen$level == "1")) # for example library (sf) # needed for following subselect operation essen < essen [index, ] graph < weight_streetnet (essen, wt_profile = "foot") graph < graph [which (graph$component == 1), ] d < dodgr_dists (graph, from = xy, to = xy) }