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Distances on Directed Graphs in R

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Current checks both on GitHub and CRAN windows machines fail when the cache is switched off. They have been skipped with this line: https://github.com/ATFutures/dodgr/blob/08c5760c1d9df6c0f0f90b8708061552b991180b/tests/testthat/test-cache.R#L65 Need to find out what is...

must do

I tried a minimal network with 5 edges joined at two nodes: ![image](https://user-images.githubusercontent.com/4107631/48987009-0efe2280-f16f-11e8-8290-4edad8546458.png) ```R edges

After #69 ad #89, `dodgr` will be able to calculate centrality more efficiently than `igraph`, and it will be straightforward to adapt existing code to do so.

must do
Documentation

It's high time that was broken into at least: - distances and times - flow aggregation - isodistances and isochrones

must do
Documentation

running to keep up with [`stplanr` ...](https://github.com/ropensci/stplanr/issues/334)

must do
Documentation

Is it possible to calculate angular betweenness of edges in a network?

future stuff

Extending from discussions with @Robinlovelace & @fiftysevendegreesofrad [here](https://github.com/ITSLeeds/snet/issues/4) (private repo), in relation to the ["Urban Network Analysis" software](http://cityform.mit.edu/projects/urban-network-analysis.html), which offers a metric of network redundancy. ### Urban Network Analysis "Redundancy...

future stuff

Coz i'm pretty sure nobody uses them anyway, and the differences are very generally extremely minor. It was interesting to start with, but reducing to binary heap will simplify the...

enhancement
simplification

Current work on [New York city pedestrian flows](https://github.com/ATFutures/who3/tree/master/calibration), via [`moveability/calibration` repo](https://github.com/moveability/calibration) uses Spatial Interaction models input to [`dodgr_flows_aggregate()`](https://atfutures.github.io/dodgr/reference/dodgr_flows_aggregate.html) via the entirely arbitrary `flows` argument, which is a > Matrix of...

must do
Documentation

The current code does not return a minimal cycle basis at all. Maybe implement the same algorithm as [`networkx`](https://networkx.github.io/documentation/networkx-2.1/reference/algorithms/generated/networkx.algorithms.cycles.minimum_cycle_basis.html) (with code [here](https://networkx.github.io/documentation/networkx-1.10/_modules/networkx/algorithms/cycles.html)), which is described in [this paper](https://link.springer.com/article/10.1007/s00453-007-9064-z) (direct pdf...