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/usr/lib/R/site-library/bit64/INDEX is in r-cran-bit64 0.9-7-2.

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The actual contents of the file can be viewed below.

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[.integer64             Extract or Replace Parts of an integer64 vector
as.character.integer64
                        Coerce from integer64
as.data.frame.integer64
                        integer64: Coercing to data.frame column
as.integer64.character
                        Coerce to integer64
benchmark64             Function for measuring algorithmic performance
                        of high-level and low-level integer64 functions
benchmark64.data        Results of performance measurement on a Core i7
                        Lenovo T410 8 GB RAM under Windows 7 64bit
bit64-package           A S3 class for vectors of 64bit integers
bit64S3                 Tunrning base R functions into S3 generics for
                        bit64
c.integer64             Concatenating integer64 vectors
cache                   Atomic Caching
cumsum.integer64        Cumulative Sums, Products, Extremes and lagged
                        differences
duplicated.integer64    Determine Duplicate Elements of integer64
format.integer64        Unary operators and functions for integer64
                        vectors
hashcache               Big caching of hashing, sorting, ordering
hashmap                 Hashing for 64bit integers
identical.integer64     Identity function for class 'integer64'
is.sorted.integer64     Small cache access methods
keypos                  Extract Positions in redundant dimension table
match.integer64         64-bit integer matching
optimizer64.data        Results of performance measurement on a Core i7
                        Lenovo T410 8 GB RAM under Windows 7 64bit
prank                   (P)ercent (Rank)s
qtile                   (Q)uan(Tile)s
ramsort.integer64       Low-level intger64 methods for in-RAM sorting
                        and ordering
rank.integer64          Sample Ranks from integer64
rep.integer64           Replicate elements of integer64 vectors
seq.integer64           integer64: Sequence Generation
sort.integer64          High-level intger64 methods for sorting and
                        ordering
sortnut                 Searching and other uses of sorting for 64bit
                        integers
sum.integer64           Summary functions for integer64 vectors
table.integer64         Cross Tabulation and Table Creation for
                        integer64
tiepos                  Extract Positions of Tied Elements
unipos                  Extract Positions of Unique Elements
unique.integer64        Extract Unique Elements from integer64
xor.integer64           Binary operators for integer64 vectors