Routines for simple graphs and network analysis. It can
  handle large graphs very well and provides functions for generating random
  and regular graphs, graph visualization, centrality methods and much more.

graphics, grDevices, magrittr, Matrix, pkgconfig (>= 2.0.0),
stats, utils

ape, digest, graph, igraphdata, rgl, scales, stats4, tcltk,
testthat, withr

gmp (optional), libxml2 (optional), glpk (optional)

'adjacency.R' 'auto.R' 'assortativity.R' 'attributes.R'
'basic.R' 'bipartite.R' 'centrality.R' 'centralization.R'
'cliques.R' 'cocitation.R' 'cohesive.blocks.R' 'community.R'
'components.R' 'console.R' 'conversion.R' 'data_frame.R'
'decomposition.R' 'degseq.R' 'demo.R' 'embedding.R' 'epi.R'
'fit.R' 'flow.R' 'foreign.R' 'games.R' 'glet.R' 'hrg.R'
'igraph-package.R' 'incidence.R' 'indexing.R' 'interface.R'
'iterators.R' 'layout.R' 'layout_drl.R' 'lazyeval.R' 'make.R'
'minimum.spanning.tree.R' 'motifs.R' 'nexus.R' 'operators.R'
'other.R' 'package.R' 'palette.R' 'par.R' 'paths.R' 'plot.R'
'plot.common.R' 'plot.shapes.R' 'pp.R' 'print.R' 'printr.R'
'random_walk.R' 'rewire.R' 'scan.R' 'scg.R' 'sgm.R'
'similarity.R' 'simple.R' 'sir.R' 'socnet.R' 'sparsedf.R'
'structural.properties.R' 'structure.info.R' 'test.R'
'tkplot.R' 'topology.R' 'triangles.R' 'utils.R' 'uuid.R'
'versions.R' 'weakref.R' 'zzz-deprecate.R'

S original by Steve Dutky <sdutky@terpalum.umd.edu> initial R
        port and extensions by Martin Maechler; revised and modified
        by Steve Dutky

Functions for bitwise operations on integer vectors.

Interface and language bindings to Tcl/Tk GUI elements.

c(
    person("Hadley", "Wickham", , "hadley@rstudio.com", c("aut", "cre")),
    person("RStudio", role = c("cph", "fnd")),
    person("R Core team", role = "ctb",
      comment = "Implementation of utils::recover()")
    )

Software testing is important, but, in part because it is 
    frustrating and boring, many of us avoid it. 'testthat' is a testing framework 
    for R that is easy to learn and use, and integrates with your existing 'workflow'.