Michel Lang [cre, aut] (<https://orcid.org/0000-0001-9754-0393>),
  R Core Team [aut]

person("Hadley", "Wickham", , "hadley@rstudio.com", c("aut", "cre"))

An extension to stopifnot() that makes it easy to declare 
    the pre and post conditions that you code should satisfy, while also 
    producing friendly error messages so that your users know what's gone
    wrong.

'assert-that.r' 'on-failure.r' 'assertions-file.r'
'assertions-scalar.R' 'assertions.r' 'base.r'
'base-comparison.r' 'base-is.r' 'base-logical.r' 'base-misc.r'
'utils.r' 'validate-that.R'

Sparse and Dense Matrix Classes and Methods

c(person("Douglas","Bates", role="aut")
 , person("Martin","Maechler", role = c("aut","cre"), email="mmaechler+Matrix@gmail.com",
          comment = c(ORCID = "0000-0002-8685-9910"))
 , person("Timothy A.", "Davis", role="ctb",
           comment = c("SuiteSparse and 'cs' C libraries, notably CHOLMOD, AMD;
		       collaborators listed in
			dir(pattern = '^[A-Z]+[.]txt$', full.names=TRUE,
			    system.file('doc', 'SuiteSparse', package='Matrix'))"))
 , person("Jens", "Oehlschlägel", role="ctb", comment="initial nearPD()")
 , person("Jason", "Riedy", role="ctb",
          comment = c("condest() and onenormest() for octave",
 	  	      "Copyright: Regents of the University of California"))
 , person("R Core Team", role = "ctb", comment="base R matrix implementation")
 )

A rich hierarchy of matrix classes, including triangular,
   symmetric, and diagonal matrices, both dense and sparse and with
   pattern, logical and numeric entries.   Numerous methods for and
   operations on these matrices, using 'LAPACK' and 'SuiteSparse' libraries.

methods, graphics, grid, stats, utils, lattice

not possible, since we use data/*.R *and* our classes

Douglas Bates [aut],
  Martin Maechler [aut, cre] (<https://orcid.org/0000-0002-8685-9910>),
  Timothy A. Davis [ctb] (SuiteSparse and 'cs' C libraries, notably
    CHOLMOD, AMD; collaborators listed in dir(pattern =
    '^[A-Z]+[.]txt$', full.names=TRUE, system.file('doc',
    'SuiteSparse', package='Matrix'))),
  Jens Oehlschlägel [ctb] (initial nearPD()),
  Jason Riedy [ctb] (condest() and onenormest() for octave, Copyright:
    Regents of the University of California),
  R Core Team [ctb] (base R matrix implementation)