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/usr/lib/R/site-library/gtools/INDEX is in r-cran-gtools 2.6.2-1.

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The actual contents of the file can be viewed below.

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ELISA                   Data from an ELISA assay
addLast                 Add a function to be executed when R exits.
ask                     Display a prompt and collect the user's
                        response
binsearch               Binary Search
capture                 Capture printed output of an R expression in a
                        string
checkRVersion           Check if a newer version of R is available
combinations            Enumerate the Combinations or Permutations of
                        the Elements of a Vector
defmacro                Define a macro
foldchange              Compute fold-change or convert between
                        log-ratio and fold-change.
gtools-deprecated       Deprecated Functions in the gtools package
invalid                 Test if a value is missing, empty, or contains
                        only NA or NULL values
keywords                List valid keywords for R man pages
logit                   Generalized logit and inverse logit function
mixedsort               Order or Sort strings with embedded numbers so
                        that the numbers are in the correct order
odd                     Detect odd/even integers
permute                 Randomly Permute the Elements of a Vector
quantcut                Create a Factor Variable Using the Quantiles of
                        a Continuous Variable
rdirichlet              Functions for the Dirichlet Distribution
running                 Apply a Function Over Adjacent Subsets of a
                        Vector
scat                    Display debugging text
setTCPNoDelay           Modify the TCP\_NODELAY ('de-Nagle') flag for
                        socket objects
smartbind               Efficient rbind of data framesy, even if the
                        column names don't match