See https://github.com/igraph/rigraph/blob/3299d31/src/vendor/cigraph/CHANGELOG.md for a complete changelog of the bundled C core, and https://github.com/igraph/rigraph/compare/f3fa58b..3299d31#diff-aeb78e0159780a9b26daabaf6f95f450b0cfec7161fc735f27ad69145a57dc84 for the changes since the igraph 2.0.1. (A permanent link to the most recent changelog of the C core used in the R package is https://github.com/igraph/rigraph/blob/main/src/vendor/cigraph/CHANGELOG.md.)
voronoi_cells() to compute the Voronoi partitioning of a graph (#1173).rglplot(edge_label = ) (#1267).x11() usage in example happen only in interactive sessions (#1301).min_st_separators() documentation (#1264).@seealso, and use it (#1270).@seealso from ?sample_pa (#1268).is_separator() and is_min_separator() (#1263).upgrade_graph() instead of the nonexisting upgrade_version() (#1252).is_bipartite() manual page from other manual page (#1230).CITATION.cff contains only the first three version components.barabasi.game() with sample_pa() (#1291).are_adjacent(), avoid deprecated igraph_are_connected() C function (#1254).See https://github.com/igraph/rigraph/blob/f3fa58b/src/vendor/cigraph/CHANGELOG.md for a complete changelog of the bundled C core, and https://github.com/igraph/rigraph/compare/1bd2bf79..f3fa58b#diff-aeb78e0159780a9b26daabaf6f95f450b0cfec7161fc735f27ad69145a57dc84 for the changes since the igraph 2.0.1. (A permanent link to the most recent changelog of the C core used in the R package is https://github.com/igraph/rigraph/blob/main/src/vendor/cigraph/CHANGELOG.md.)
g + vertices(1, 2, foo = 3) works again, regression introduced in igraph 2.0.0 (#1247).sample_pa() respects the out.seq and out.dist arguments again, regression introduced in igraph 2.0.0 (#1226).isomorphisms() and subgraph_isomorphisims(method = "vf2") work again, regression introduced in 2.0.0 (#1219).biconnected_components() now returns edge and vertex sequences again, regression introduced in 2.0.0 (#1213).order and order.out components returned by dfs(), regression introduced in 2.0.0 (#1179).realize_bipartite_degseq() creates a bipartite graph from two degree sequences (#1212).is_biconnected() checks if a graph is biconnected (#1204).distances() now supports the Floyd-Warshall algorithm (#1186).mean_distance() docs."dsatur" heuristic for greedy_vertex_coloring() (#1206).?articulation_points (#1191).isomorphisms() and subgraph_isomorphisms() (#1225).config.h defines HAVE___UINT128_T (#1216).which program during configuration (#1232).configure manage libxml multiple include paths (#1197).configure (#1235).HAVE_GFORTRAN flag for win and ucrt (#1171).make_empty_graph() is now fully auto-generated (#1068).is.R() which is deprecated in R 4.4.0.-Wlto warnings (#1163).This major release brings development in line with the C core at https://github.com/igraph/igraph. See https://github.com/igraph/rigraph/blob/1bd2bf79/src/vendor/cigraph/CHANGELOG.md for a complete changelog, in particular the section “Breaking changes”. (A permanent link to the most recent changelog of the C core used in the R package is https://github.com/igraph/rigraph/blob/main/src/vendor/cigraph/CHANGELOG.md.)
Version 1.6.0 of the R package used version 0.9.9 of the C core. The changes in the 0.10 series of the C core are relevant for version 2.0.0 of the R package, but not all C core functions are exposed in the R interface. Changes to the implementation of some functions in the C core may be reflected in functions in the R package.
The change log below is a summary of the additional changes in the R interface.
get.edge.ids(multi = TRUE) and as_adjacency_matrix(edges = ) are no longer supported (#1101, #1080).
Remove NA padding for dfs(unreachable = FALSE)$order and $order.out and for bfs(unreachable = FALSE)$order, also for igraph_options(return.vs.es = FALSE) (#1062, #1124).
laplacian_matrix(normalized = TRUE) uses a different normalization method (#1102).
fit_power_law() no longer returns a KS.p component.
Remove default value for loops argument of centr_degree_tmax() (#1114).
as_adjacency_matrix() no longer supports attributes of type character (#1072).
Remove graph.isomorphic.34() (#1065, #1067).
Use lifecycle::deprecate_soft() for most deprecated functions (#1024, #1025, #1104).
The system libraries GLPK, GMP, and libxml2 are now mandatory for compiling from source.
Add scalar conversion checks in a few critical places (#1069).
Check that we receive a scalar when expecting a scalar in C code (#1051).
Check that matrix sizes are in the supported range before passing them to R (#1066).
transitivity() now produces a named vector in the local (weighted) case (#1057).
plot() correctly computes intersections between edges and rectangle vertices (#1021).
Fix compilation on Windows with spaces in the Rtools path (#1000).
Use 30 bits of R’s RNG (#1079).
Breaking change: Remove NA padding for dfs(unreachable = FALSE)$order and $order.out and for bfs(unreachable = FALSE)$order, also for igraph_options(return.vs.es = FALSE) (#1062, #1124).
New k_shortest_paths() to compute the first k shortest paths between two vertices (#1028).
Add GitHub bug report form.
New vignette("deprecated-dot-case") that lists deprecated functions and their alternatives (#1013).
Move deprecation badge to top of doc pages.
Remove usage of get.adjacency() from intro vignettes (#1084).
Fix math formatting in fit_power_law() docs.
Fix incorrect usage in subgraph.edges() example.
Clarify that Infomap considers edge directions.
Improve edge connectivity docs (#1119).
Add some missing diacritics.
Use [] assignment for converting matrices (#1035).
Move towards autogenerating all bindings (#1043).
Use %||% from rlang (#1112).
Replace loop by lapply() when returning vertex and edge sets (#1033).
Do not duplicate prototypes, use a common header for rinterface.c and rinterface_extra.c (#1055).
Clean up some auto-generation code (#1031), remove unused parts from code generation (#1032), eliminate the use of some deprecated C functions.
Use integers for mode enum in cluster_label_prop().
Standardize the handling of some stimulus enum types (#1064).
Remove unused vectorlist / matrixlist destructors (#1070).
Remove unused stimulus type VERTEXSETLIST_INT (#1049).
Remove unused types (#1060).
Fix Stimulus definitions (#997).
Avoid deprecated R_igraph_automorphisms() (#999).
Use new ARPACK_DEFAULTS symbol from C core for default arpack options.
Ignore upstream CITATION file to avoid R CMD check NOTE (#1007).
Add Aviator configuration.
Add as_biadjacency_matrix() tests for named vectors (#1154, #1155).
Test transferring colors in isomorphism functions (#1050).
New arpack_defaults() replaces igraph.arpack.default and arpack_defaults lists (#800), with consistent usage checks (#966).
Define methods for ape::as.phylo() instead of own as_phylo() generic, remove deprecated asPhylo() (#763).
bfs() with unreachable nodes returns zero instead of NaN as rank (#956), and negative instead of NaN for dist (#926).
random_walk() adds one more step, the resulting list of vertices is of length steps + 1 (#934).
girth() returns Inf for acyclic graphs (#931).
Remove some behaviour / parameters that were deprecated in 1.3 (#842).
Remove scg_eps(), scg_group() and scg_semi_proj(), broken and no longer maintained (#946).
Fix printf() warning (#975).
Fix calls to isSymmetric() for matrix objects with a class (#965).
Reduce frequency of interruption checks (#957).
Change “incidence matrix” naming to “biadjacency matrix” (#962).
Add aliases using the neighborhood terminology for all ego functions: (#950).
Rename arguments to assortativity(values, values.in) from types1 and types2 (#952).
Add ellipsis to cluster_label_prop() (#954).
Placeholders for is_acyclic() and is_forest(), to be implemented in igraph 2.0.0 (#945).
is_tree(details = TRUE) designates the first vertex as root for non-trees (#935).
all_shortest_paths() returns the vertex list in both res and vpaths components (#930).
Improve symmetry check for adjacency matrices on input (#911).
Warn if non-symmetric undirected adjacency matrix (#904).
Remove duplicate \seealso{} (#948).
Update knnk() and sir() docs.
Fix formula in reciprocity() docs.
strength() does not give a warning when no weights are given.
Update sample_smallworld() manual page (#895).
Correct documentation for weighted cliques.
Update Erdos-Renyi model docs.
Clean up tests (#967).
Stabilize tests for cluster_label_prop() (#932), sample_pa() (#927), cluster_louvain() (#933), SIR (#936), sample_forestfire() (#929).
Hard-code graph used in test (#928).
Update GML test file (#925).
Improve test for sampling from Dirichlet distribution (#923).
Omit test that no longer holds with igraph 0.10 (#922).
Stabilize test in preparation for upgrade (#920).
Stabilize plot test (#919).
Fix checks.
estimate_betweenness(), estimate_edge_betweenness(), estimate_closeness() (#852).identical_graphs() now correctly detects identical graphs without node or edge attributes (#757).Change ownership rules of attribute objects (#870).
R_SEXP_to_igraph() and R_SEXP_to_igraph_copy() get igraph_t object from external pointer (#865).
Remove ETIME() call from Fortran code, already in CRAN version 1.5.0.1 (#858).
Ensure that _GNU_SOURCE is always defined (#877).
Fix make clean (#860).
Fix generation of code for functions with VERTEX_COLOR out-arguments (#850).
Use -lquadmath in Makevars.win, for compatibility with alternative R distributions such as Microsoft R Open (#855).
getRversion() uses strings.
Add cffr file and a GHA workflow that updates it automatically (#873).
Undeprecate neighborhood() (#851).
Remove redundant reference to AUTHORS from DESCRIPTION.
estimate_betweenness(), estimate_edge_betweenness(), estimate_closeness() (#852).The internal format of graph objects has changed in a mostly backward-compatible way, to prepare for upgrading the C core to 0.10. Details are described at https://github.com/igraph/rigraph/wiki/The-igraph-object-format. Accessing graph objects that have been created with an older igraph version give a clean error message with instructions (#832). The new format cannot be read by igraph 1.4.3 or older, the following error is raised when trying to do so:
This graph was created by an old(er) igraph version.
Call upgrade_graph() on it to use with the current igraph version
For now we convert it on the fly...
Error in is_directed(object) :
REAL() can only be applied to a 'numeric', not a 'NULL'The only supported remedy is to upgrade the igraph package to version 1.5.0 or later.
graph_version() now returns an integer scalar (#832, #847), 4 as of igraph 1.5.0 (#835).
Vertex and edge sequences are converted to numeric vectors when used in attributes (#808).
New largest_component() returns the largest connected component (#786, @ngmaclaren).
make_graph() when simplify = ... is used with a non-formula (#834).Add more tests for graph_from_literal() (#826).
Reenable serialization test and tests for dyad_census(), stabilize tests (#809, #822, #823).
The documentation for the R package is now hosted at https://r.igraph.org/ (#780).
Update vignette("installation-troubleshooting").
Fix use of deprecated functions in examples, e.g., replace gsize() by ecount() (#827).
Fix typos in ?eigen_centrality docs (@JJ).
Update CONTRIBUTING.md and ORCID information (#791, #774).
Add DOI to CITATION (#773).
Add data for old igraph versions as constructed objects, and tests (#838).
Ensure we’re always using named indexes to access the internal data structure (#784).
Prepare migration to igraph/C 0.10 (#781).
Update generated interface (#765).
Fix tests for dev waldo (#779, @hadley).
Fix linking on Windows: gfortran needs quadmath. (#778).
Remove igraph.eigen.default() and eigen_defaults, introduce internal eigen_defaults() as a function (#741).
Remove broken nexus*() functions (#705), and srand() (#701).
Update C core.
ARPACK-based calculations are now interruptible.
shortest_paths() and all_shortest_paths() no longer crash when an invalid from vertex is passed and weights are being used.
See diff for details.
Use true vertex names for printing vertex sets. If a vertex set captures a relationship between vertices (e.g., the father component of bfs()), the vertex set is printed as a named vector (#754).
Suggest restarting R session after fatal error (#745).
as_long_data_frame() now correctly processes vertex attributes and works with graphs without vertex attributes (#748).
as.hclust(hrg.fit(g)) works again (#721).
The documentation is now available at https://igraph.org/ (#743).
Reorganize function reference (#662).
Replace graph() with make_graph() in examples (#738).
Add docs for as.hclust.igraphHRG() (#733).
Merged man page of hub_score() and authority_score() (#698).
Refactor contributors listing (#647).
Improve “family” titles (#679).
Improve docs of ego/neighborhood functions.
Improve transitivity() docs.
Introduce cpp11 package to improve error handling in the long run (#720).
Avoid longjmp for error handling and interrupts (#751).
as.hclust.igraphHRG uses .Call() interface (#727).
console() now works again and provides a Tcl/Tk based UI where igraph can post status messages and progress info (#664).
Fix errors when printing long vertex names (#677, @ahmohamed).
Fix regression that broke builds on some systems (e.g., GCC version 5 or earlier), introduced in igraph 1.4.0 (#670, #671).
fit_hrg() does not crash any more when called with a graph that has less than three vertices.
Fix warning about yyget_leng() returning wrong type when using LTO (#676).
Don’t mention C++11 or C++17 for best compatibility with both newest R and older compilers, while still requesting a C++ compiler for linking.
Don’t ignore build/ when building the package because the vignette index is built there.
Skip plot test entirely on R-devel.
Avoid submodules for building igraph (#674).
Makevars cleanup (#671).
Add Zenodo configuration file.
tkplot() gained a palette argument and it is now using the same palette as plot() by default, for sake of consistency.plot.igraph() gained a loop.size argument that can be used to scale the common radius of the loop edges.cluster_leading_eigen().igraph_version() returned an invalid value in 1.3.4, this is now corrected.par(xpd=...) is now restored after plotting a graph.as.dendrogram.communities() for large dendrograms, thanks to @pkharchenko (see PR #292).graph_from_incidence_matrix() that prevented the creation of directed graphs with mode="all" from dense or sparse matrices.dfs() accidentally returned zero-based root vertex indices in the result object; this is now fixed and the indices are now 1-based.as_graphnel() does not duplicate loop edges any more.as_graphnel() now checks that the input graph has no multi-edges. Multi-edges are not supported by the graphNEL class.convex_hull() now returns the vertices of the convex hull with 1-based indexing.rgl.*() function calls in the codebase were replaced with equivalent *3d() function calls in preparation for upcoming deprecations in rgl (see PR #619)plot.igraph() does not use the frame=... partial argument any more when calling plot.default(). The default NULL value of frame.plot is now also handled correctly.hub_score() and authority_score() considered self-loops only once on the diagonal of the adjacency matrix of undirected graphs, thus the result was not identical to that obtained by eigen_centrality() on loopy undirected graphs. This is now corrected.distances() no longer ignores the mode parameter when algorithm='johnson'.automorphisms() was renamed to count_automorphisms(); the old name is still available, but it is deprecated.main branch directly.pkgdown thanks to @maelle (see #645). This will eventually become the official homepage.Added:
mark.groups=... argument of plot.igraph() now accepts communities objectsFixed:
Negative degree exponents are not allowed any more in sample_pa() and sample_aging_pa().
Package updated to be compatible with Matrix 1.5.
Other:
Added:
sample_asym_pref() now returns the generated types of the vertices in the vertex attributes named outtype and intype.Fixed:
layout_nicely() does not recurse infinitely any more if it is assigned to the layout attribute of a graph
layout_nicely() now ignores edge weights when there are non-positive edge weights. This is needed because igraph 1.3.3 started validating edge weights in layout_with_fr() and layout_with_drl(), resulting in errors when layout_nicely() was used on weighted graphs with negative weights. Since layout_nicely() is the default layout algorithm for plot(), most users were not even aware that they were using the FR or DrL layouts behind the scenes. Now the policy is that layout_nicely() attempts to get the job done without errors if possible, even if that means that edge weights must be ignored. A warning is printed if this is the case.
Added:
reverse_edges() reverses specific or all edges in a graph.
Single-bracket indexing of V() and E() resolves attribute names in the indexing expressions by default (for instance, E(g)[weight > x] matches edges with a weight larger than a threshold). This can be problematic if the attribute masks one of the variables in the local evaluation context. We now have a pronoun called .env (similarly to rlang::.env) that allows you to force attribute name lookup to the calling environment. For sake of completeness, we also provide .data (similarly to rlang::.data) to force attribute name lookup to the vertex / edge attributes only. These pronouns are automatically injected into the environment where the indexing expression is evaluated.
Deprecated:
V() or E() indexing start with a dot since igraph 1.1.1; however, the old dotless names did not print a deprecation warning so this may have gone unnoticed for years. We are introducting a deprecation warning for nei(), innei(), outnei(), inc(), from() and to() inside single-bracket indexing of vertex and edge sequences and will remove the old variants soon.The C core is updated to 0.9.9, fixing a range of bugs.
Fixed:
communities objects is now reported correctly.layout_with_kk() would fail to produce reasonable results with the default initial coordinates. This has been corrected, however, this function no longer produces precisely the same output for a given graph as before. To restore the previous behaviour, use layout_with_kk(g, coord=layout_in_circle(g)) in 2D or layout_with_kk(g, dim=3, coord=layout_on_sphere(g)) in 3D.igraph.vs object with v[x, na_ok=T] now correctly handles the na_ok argument in all cases; previous versions ignored it when x was a single number.Other:
Fixed:
graph_from_adjacency_matrix() now works with sparse matrices even if the cell values in the sparse matrix are unspecified.cluster_walktrap() when modularity=FALSE and membership=FALSE.cluster_walktrap() no longer accepts invalid weight vectors.cluster_walktrap() no longer returns a modularity vector of invalid length for disconnected graphs. This also fixes some rare failures of this function on weighted disconnected graphs.edge_attr() does not ignore its index=... argument any more.automorphisms(), automorphism_group() and canonical_permutation() now allow all possible values supported by the C core in the sh argument. Earlier versions supported only "fm".vertex.frame.width plotting parameter now allows zero and negative values; these will simply remove the outline of the corresponding vertex.sh argument of the BLISS isomorphism algorithm in isomorphic() was fixed; earlier versions incorrectly referred to sh1 and sh2.dominator_tree() now conforms to its documentation with respect to the dom component of the result: it contains the indices of the dominator vertices for each vertex and -1 for the root of the dominator tree."power" algorithm of page_rank() have been removed from the documentation, as this method is no longer available.The C core is updated to 0.9.7, fixing a range of bugs and introducing a number of new functions.
Added:
has_eulerian_path() and has_eulerian_cycle() decides whether there is an Eulerian path or cycle in the graph.eulerian_path() and eulerian_cycle() returns the edges and vertices in an Eulerian path or cycle in the graph.any_loop() checks whether a graph contains at least one loop edge.is_tree() checks whether a graph is a tree and also finds a possible rootto_prufer() converts a tree graph into its Prufer sequencemake_from_prufer() creates a tree graph from its Prufer sequencesample_tree() to sample labelled trees uniformly at randomsample_spanning_tree() to sample spanning trees of an undirected graph uniformly at randomautomorphisms() and canonical_permutation() now supports vertex colorsrandom_edge_walk() to record the edges traversed during a random walkharmonic_centrality() calculates the harmonic centrality of vertices, optionally with a cutoff on path lengthsmean_distance() now supports edge weights and it can also return the number of unconnected vertex pairs when details=TRUE is passed as an argumentgreedy_vertex_coloring() finds vertex colorings based on a simple greedy algorithm.bridges() finds the bridges (cut-edges) of a graphframe.width vertex attribute or the vertex.frame.width keyword argument, thanks to @simoncarrignon . See PR #500 for more details.automorphism_group() returns a possible (not necessarily minimal) generating set of the automorphism group of a graph.global_efficiency() calculates the global efficiency of the graph.local_efficiency() calculates the local efficiency of each vertex in a graph.average_local_efficiency() calculates the average local efficiency across the set of vertices in a graph.rewire(each_edge(...)) now supports rewiring only one endpoint of each edge.realize_degseq() generates graphs from degree sequences in a deterministic manner. It is also available as make_(degseq(..., deterministic=TRUE)).clique_size_counts() counts cliques of different sizes without storing them all.feedback_arc_set() finds a minimum-weight feedback arc set in a graph, either with an exact integer programming algorithm or with a linear-time approximation.make_bipartite_graph() now handles vertices with names.shortest_paths() now supports graphs with negative edge weights.min_cut() now supports s-t mincuts even if value.only=FALSE.as.matrix() now supports converting an igraph graph to an adjacency or edge list matrix representation. See as.matrix.igraph() for more details. This function was migrated from intergraph; thanks to Michal Bojanowski.Fixed:
is_connected() now returns FALSE for the null graphlength() on a graph now returns the number of vertices to make it consistent with indexing the graph with [[.diameter() now corrently returns infinity for disconnected graphs when unconnected=FALSE. Previous versions returned the number of vertices plus one, which was clearly invalid for weighted graphs.mean_distance() now correctly treats the path length between disconnected vertices as infinite when unconnected=FALSE. Previous versions used the number of vertices plus one, adding a bias towards this number, even if the graph was weighted and the number of vertices plus one was not a path length that could safely have been considered as being longer than any “valid” path.layout_with_sugiyama() now handles the case of exactly one extra virtual node correctly; fixes #85bfs() and dfs() callback functions now correctly receive 1-based vertex indices and ranks; it used to be zero-based in earlier versionsbfs() or dfs() callback does not crash R any moreprint() on a graph with a small max.lines value (smaller than the number of lines needed to print the attribute list and the header) does not raise an error any more; fixes #179as_adjacency_matrix(edges=TRUE, sparse=TRUE) now consistently returns the last edge ID for each cell in the matrix instead of summing them.+ and - operators with a path() object consisting of two vertices is now handled correctly; fixes #355topo_sort() now throws an error if the input graph is not acyclic instead of returning an incorrect partial ordering.transitivity(mode="barrat") now throw an error for multigraphs; the implementation does not work correctly for multigraphs and earlier versions did not warn about this.Changed:
neimode argument of bfs() and dfs() was renamed to mode for sake of consistency with other functions. The old argument name is deprecated and will be removed in 1.4.0.bfs() and dfs() callback functions now correctly receive 1-based vertex indices and ranks; it used to be zero-based in earlier versions. (This is actually a bugfix so it’s also mentioned in the “Fixed” section).closeness(), betweenness() and edge_betweenness() now all take a cutoff argument on their own. estimate_closeness(), estimate_betweenness() and estimate_edge_betweenness() became aliases, with identical signature. They are not deprecated but their implementation might change in future versions to provide proper estimation schemes instead of a simple cutoff-based approximation. If you explicitly need cutoffs and you want your results to be reproducible with future versions, use closeness(), betweenness() and edge_betweenness() in your code with a cutoff argument.closeness() now only considers reachable vertices during the calculation; in other words, closeness centrality is now calculated on a per-component basis for disconnected graphs. Earlier versions considered all vertices.Deprecated:
cutoff=0 for closeness(), betweenness() and edge_betweenness() is deprecated; if you want exact scores, use a negative cutoff. cutoff=0 will be interpreted literally from igraph 1.4.0.centr_degree_tmax() now prints a warning when it is invoked without an explicit loops argument. loops will be mandatory from igraph 1.4.0.nexus_list(), nexus_info(), nexus_get() and nexus_search() functions now return an error informing the user that the Nexus graph repository has been taken offline (actually, several years ago). These functions will be removed in 1.4.0.edges argument of as_adjacency_matrix() is deprecated; it will be removed in igraph 1.4.0.Removed:
page_rank_old() function and the deprecated power method of page_rank() were removed.Dec 27, 2021
No user visible changes.
Dec 14, 2021
Fixed:
igraph were accidentally built without GraphML support on CRAN; this should now be fixed.Nov 22, 2021
No user visible changes.
Oct 26, 2021
No user visible changes.
Oct 15, 2021
The C core is updated to 0.8.5, fixing a range of bugs and introducing a number of new functions.
Added:
Fixed:
make_lattice() correctly rounds length to the nearest integer while printing a warning (#115).make_empty_graph(NULL) now prints an error instead of producing an invalid graph (#404).make_graph(c()) now produces an empty graph instead of printing a misleading error message (#431).types argument of functions related to bipartite graphs now prints a warning when the types are coerced to booleans (#476).layout_with_sugiyama() returns a layout of type matrix even if there is only one vertex in the graph (#408).Deprecated:
membership argument of modularity.matrix() is now deprecated as the function never needed it anyway.modularity() now prints a warning when it is applied on a directed graph because the implementation in igraph’s C core does not support directed graphs as of version 0.8.5. The warning will be turned into an error in the next minor (1.3.0) version of the R interface; the error will be removed later when the C core is updated to a version that supports modularity for directed networks.transitivity() now prints a warning when its local variant (type="local") is called on a directed graph or a graph with multiple edges beecause the implementation in the C core of igraph does not work reliably in these cases as of version 0.8.5. The warning will be turned into an error in the next minor (1.3.0) version of the R interface; the error will be removed later when the C core is updated to a version that supports transitivity for networks with multiple edges.Misc:
Oct 5, 2020
No user visible changes.
Mar 27, 2020
No user visible changes.
Feb 13, 2019
No user visible changes.
Jan 27, 2019
No user visible changes.
Jul 27, 2018
No user visible changes.
cluster_optimal() function does not work. Unfortunately we cannot bundle the GLPK library into igraph on CRAN any more, because CRAN maintainers forbid the pragmas in its source code.Jul 20, 2017
Jul 13, 2017
graph_id function was addededge_attr for some index valuesbfs() bug, restricted argument was zero-basedmatch_vertices is exported now%>% is re-exported in a better way, to avoid interference with other packagesego_ functions default to order = 1 nowigraph_with_opt to run code with temporary igraph options settingssample_asym_pref functioncurve_multiple to avoid warnings for graphs with self-loops.NMF package is only suggested now, it is not a hard dependencypkgconfig package for options. This allows setting options on a per-package basis. E.g. a package using igraph can set return.vs.es to FALSE in its .onLoad() function, and then igraph will return plain numeric vectors instead of vertex/edge sequences if called from this package.igraph_options() returns the old values of the updated options, this is actually useful, returning the new values was not.with_igraph_opt() function to temporarily change values of igraph options.get.edge() is deprecated, use ends() instead. (This was already the case for igraph 1.0.0, but we forgot to add a NEWS point for it.).Call(), to make native calls faster.anyNA() call, to be compatible with older R versions.head_of() and tail_of(), they were mixed up.label.dist independent of label lengths, fixes #63.R CMD check NOTEs.modularity().str.igraph() to print_all().V() or E() indexing now begin with a dot. Old names are deprecated. New names: .nei(), .innei(), .outnei(), .inc(), .from(), .to(). #22layout_with_dh, layout_with_gem and layout_with_sugiyama. They crashed in some cases.June 26, 2015
Some minor updates:
June 21, 2015
This is a new major version of igraph, and then why not call it 1.0.0. This does not mean that it is ready, it’ll never be ready.
The biggest changes in the release are - the new function names. Most functions were renamed to make them more consistent and readable. (Relax, old names can still be used, no need to update any code.) - Better operations for vertex and edge sequences. Most functions return proper vertex/edge sequences instead of numeric ids. - The versatile make_() and make_graph() functions to create graphs.
make_graph() function to create graphs.layout_() (not the underscore!) function to create graph layouts, see also add_layout_().upgrade_graph() on graphs created with previous igraph versions.[[ operator now, for easy viewing of vertex/edge metadata.as_ids() function to convert them to simple ids.layout_with_dh().layout_with_gem().mindist parameter for the smallest distance to consider.all_simple_paths() function to list all simple paths in a graph.triangles() lists all triangles in a graph.local_scan() function calculates scan statistics.embed_adjacency_matrix() and embed_laplacian_matrix().*, the same graph multiple times. Can be also used as rep().random_walk()adjacent_vertices() and incident_edges() functions, they are vectorized, as opposed to neighhors() and incident().as_long_data_frame().Too many to list. Please try if your issue was fixed and (re-)report it if not. Thanks!
April 21, 2014
Some bug fixes, to make sure that the code included in ‘Statistical Analysis of Network Data with R’ works. See https://github.com/kolaczyk/sand
l, not x, which is for complex attributes. Issue #578.communities objects, see create.communities(). Issue #547.constaint(), issue #580.simplify argument of graph.formula(), which was broken, issue #586.crossing() adds better names to the result, fixes issue #587.sir() function gives an error if the input graph is not simple, fixes issue #582.February 4, 2014
There are a bunch of new features in the library itself, and other important changes in the life of the project. Thanks everyone for sending code and reporting bugs!
igraph’s development has moved from Launchpad to github. This has actually happened several month ago, but never announced officially. The place for reporting bugs is at https://github.com/igraph/igraph/issues.
igraph’s homepage is now hosted at http://igraph.org, and it is brand new. We wanted to make it easier to use and modern.
You can download nightly builds from igraph at http://igraph.org/nightly. Source and binary R packages (for windows and OSX), are all built.
demo(hrg).mod.matrix().layout.bipartite() function, a simple two-column layout for bipartite graphs.barabasi.game(), algorithm psumtree-multiple just froze.layout.mds() by default returns a layout matrix now.plot.communities() (plot.igraph(), really) draws a border around the marked groups by default.name graph attribute to charactervertex.attriubutes(), graph.attributes() and edge.attributes().graph.disjoint.union() handles attributes now.graph.union() to handle attributes properly.rewire(): now supports the generation and destruction of loops.bipartite.random.game().get_shortest_paths(), reorganized the output of get.shortest.paths() completely.graphlets() and related functions.bonpow() and alpha.centrality() and make sure that the sparse solver is called.tkplot() news: enable setting coordinates from the command line via tkplot.setcoords() and access to the canvas via tkplot.canvas().igraph_edge_connectivity(), because of an un-initialized variable in the C code.closeness() and related functions.bipartite.projection().graphNEL conversion functions only load the ‘graph’ package if it was not loaded before and they load it at the end of the search path, to minimize conflicts.graph.bfs() and graph.dfs().is.chordal().centralization.closeness.tmax().arpack() now gives error message if unknown options are given.igraphtest() function.add.edges() does not allow now zeros in the vertex set.adjacent.triangles().graph.eigen() function, eigenproblems on adjacency matrices.decompose.graph() and graph.neighborhood() use it. Fixes issue #508.optimal.community(), closes #511.graph.intersection.by.name(), graph.union.by.name(), graph.difference.by.name().+ operator on graphs now calls graph.union() if both argument graphs are named, and calls graph.disjoint.union() otherwise.igraph.version().sbm.game().set.vertex/edge.attribute bug that changed both graph objects, after copying (#533)barabasi.game that caused crashes.'which argument to bipartite.projection (#307).normalized argument to closeness functions, fixes issue #3.[[ on vertex/edge sets, fixes #231.start argument in hrg.fit (#225).graph.density that resulted in incorrect values for undirected graphs with loopsgraph.decompose), causing #550.graph.adjacency bugs for graphs with one edge, and graphs with zero edges.graph.adjacency bug for undirected, weighted graphs and sparse matrices.main, sub, xlab and ylab are proper graphics parameters now (#555).graph.data.frame coerces arguments to data frame (#557).sir function.graph.mincut and related functions.graph.bfs (#575).Released Oct 28, 2013
Some bugs fixed:
Released May 16, 2013
Worked two CRAN check problems, and a gfortran bug (string bound checking does not work if code is called from C and without string length arguments at the “right” place).
Otherwise identical to 0.6.5-1.
Released February 27, 2013
Fixing an annoying bug, that broke two other packages on CRAN:
Released February 24, 2013
This is a minor release, to fix some very annoying bugs in 0.6.4:
Released February 2, 2013
The version number is not a mistake, we jump to 0.6.4 from 0.6, for technical reasons. This version was actually never really released, but some R packages of this version were uploaded to CRAN, so we include this version in this NEW file.
power.law.fit() can now use a C implementation.
Fixed a bug in the Reingold-Tilford layout when the graph is directed and mode != ALL.
Released June 11, 2012
See also the release notes at http://igraph.sf.net/relnotes-0.6.html
Released November 22, 2009
Released April 10, 2009
See also the release notes at http://igraph.sf.net/relnotes-0.5.2.html
Released July 14, 2008
See also the release notes at http://igraph.sf.net/relnotes-0.5.1.html
Released February 14, 2008
See also the release notes at http://igraph.sf.net/relnotes-0.5.html
We use match.arg whenever possible. This means that character scalar options can be abbreviated and they are always case insensitive
The maxflow/mincut functions allow to supply NULL pointer for edge capacities, implying unit capacities for all edges
Released January 1, 2008
New: - Cohesive block finding in the R interface, thanks to Peter McMahan for contributing his code. See James Moody and Douglas R. White, 2003, in Structural Cohesion and Embeddedness: A Hierarchical Conception of Social Groups American Sociological Review 68(1):1-25 - Biconnected components and articulation points. - R interface: better printing of attributes. - R interface: graph attributes can be used via ‘$’.
Bug fixed: - Erdos-Renyi random graph generators rewritten.
Released October 3, 2007
This release should work seamlessly with the new R 2.6.0 version. Some other bugs were also fixed: - A bug was fixed in the Erdos-Renyi graph generator, which sometimes added an extra vertex.
Released August 13, 2007
The next one in the sequence of bugfix releases. Thanks to many people sending bug reports. Here are the changes: - Some memory leaks removed when using attributes from R or Python. - GraphML parser: entities and character data in multiple chunks are now handled correctly. - A bug corrected in edge betweenness community structure detection, it failed if called many times from the same program/session. - Edge betweeness community structure: handle unconnected graphs properly. - Fixed bug related to fast greedy community detection in unconnected graphs. - Use a different kind of parser (Push) for reading GraphML files. This is almost invisible for users but fixed a nondeterministic bug when reading in GraphML files. - R interface: plot now handles properly if called with a vector as the edge.width argument for directed graphs. - R interface: bug (typo) corrected for walktrap.community and weighted graphs.
Released June 7, 2007
This is another bugfix release, as there was a serious bug in the R package of the previous version: it could not read and write graphs to files in any format under MS Windows.
Some other bits added: - circular Reingold-Tilford layout generator for trees - corrected a bug, Pajek files are written properly under MS Windows now. - arrow.size graphical edge parameter added in the R interface.
Released May 23, 2007
This is a minor release, it corrects a number of bugs, mostly in the R package.
Released May 21, 2007
The major new additions in this release is a bunch of community detection algorithms and support for the GML file format. Here is the complete list of changes:
is.loop and is.multiple were added
support for reading and writing GML files
modularity calculation added
loop edges are correctly plotted by all three plotting functions
somewhat better looking progress meter for functions which support it
Released Dec 19, 2006
This is a new major release, it contains many new things:
Released Aug 23, 2006
This is a bug-fix release. Bugs fixed: - reciprocity corrected to avoid segfaults - some docs updates - various R package updates to make it conform to the CRAN rules
Released Aug 18, 2006
Release time at last! There are many new things in igraph 0.2, the most important ones: - reading writing Pajek and GraphML formats with attributes (not all Pajek and GraphML files are supported, see documentation for details) - the RANDEDU fast motif search algorithm is implemented - many new graph generators, both games and regular graphs - many new structural properties: transitivity, reciprocity, etc. - graph operators: union, intersection, difference, structural holes, etc. - conversion between directed and undirected graphs - new layout algorithms for trees and large graphs, 3D layouts and many more.
New things specifically in the R package: - support for CTRL+C - new functions: Graph Laplacian, Burt’s constraint, etc. - vertex/edge sequences totally rewritten, smart indexing (see manual) - new R manual and tutorial: `Network Analysis with igraph’, still under development but useful - very basic 3D plotting using OpenGL
Although this release was somewhat tested on Linux, MS Windows, Mac OSX, Solaris 8 and FreeBSD, no heavy testing was done, so it might contain bugs, and we kindly ask you to send bug reports to make igraph better.
Released Jan 30, 2006
After about a year of development this is the first “official” release of the igraph library. This release should be considered as beta software, but it should be useful in general. Please send your questions and comments.