NEWS.md

In cppRouting: Algorithms for Routing and Solving the Traffic Assignment Problem

cppRouting v3.1

• cppRouting use tinythread as parallel backend

cppRouting v3.0

Major changes

• All C++ code have been rewritten in a much more OOP way, and can be easily used outside of Rcpp
• All routing algorithms are now implemented in subclasses of RcppParallel::Worker and are natively multithreaded
• graph are now internally represented as adjacency lists (3 vectors), which is generally 20% faster for routing
• get_path_pair, get_isochrone, get_detour and get_multi_paths are now multithreaded
• aggregating a secondary weight along shortest path is now implemented for get_distance_pair and get_distance_matrix, for both normal and contracted network, and multithreaded
• implementation of all-or-nothing assignment for both normal and contracted network, multithreaded
• link-based algorithms for the calculation of the User Equilibrium (UE) : Method of Successive Averages, variants of Frank-Wolfe algorithm (normal, conjugate, bi-conjugate). Multithreaded
• bush-based algorithm for the calculation of the User Equilibrium (UE) : algorithm-B from R.B. Dial (with batching for large OD matrix). Partially multithreaded.
• implementation of stall-on-demand technique (see Geisberger, 2008) which speed-up routing computation on a contracted network (both pairwise and matrix)

Minor changes

• bug fix in get_path_pair and get_multi_paths : node sequence listed from origin to destination node.

cppRouting v2.0

Major changes

• implementation of contraction hierarchies algorithm
• thread-safe implementation of all parallel algorithms with RcppParallel package instead of parallel
• implementation of one-to-one query algorithm on contracted graph
• implementation of many-to-many query algorithm on contracted graph
• implementation of PHAST algorithm on contracted graph

Minor changes

• new options long and keep for get_path_pair, get_isochrone and get_multi_paths functions
• remove allcores option for get_detour function
• optimization of cpp_simplify function
• optimization of makegraph function

cppRouting v1.2

Major changes

• new functions cpp_simplify, get_detour and to_df

Minor changes

• bug fix in get_distance_pair and get_path_pair : verify that origin / destination nodes are present in the graph before running c++ function
• modification of get_distance_pair and get_path_pair Rd. files : clearer explanation about the choice between algorithms
• optimization of get_distance_matrix function : if length(to) < length(from) then Dijkstra algorithm is ran from destination nodes on reversed graph

cppRouting v1.1

First CRAN release

cppRouting documentation built on Dec. 1, 2022, 5:08 p.m.