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    if neither \code{package} nor \code{dir} are given.}
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    if neither \code{package} nor \code{dir} are given.}
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  \item{lib.loc}{a character vector of directory names of \R libraries,
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  \item{lib.loc}{a character vector of directory names of \R libraries,
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    or \code{NULL}.  The default value of \code{NULL} corresponds to all
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    or \code{NULL}.  The default value of \code{NULL} corresponds to all
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    libraries currently known.  The specified library trees are used to
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    libraries currently known.  The specified library trees are used to
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    search for \code{package}.}
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    search for \code{package}.}
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  \item{registration}{a logical.  If \code{TRUE} (the default), checks
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  \item{registration}{a logical.  If \code{TRUE}, checks
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    the registration information on the call (if available).}
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    the registration information on the call (if available).}
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  \item{verbose}{a logical.  If \code{TRUE}, additional diagnostics are
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  \item{verbose}{a logical.  If \code{TRUE}, additional diagnostics are
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    printed (and the result is returned invisibly).}
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    printed (and the result is returned invisibly).}
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}
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}
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\details{
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\details{
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  named in the first \code{useDynLib} directive.
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  named in the first \code{useDynLib} directive.
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  This checks that calls with \code{PACKAGE} specified are to the
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  This checks that calls with \code{PACKAGE} specified are to the
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  same package, and reports separately those which are in base packages
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  same package, and reports separately those which are in base packages
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  and those which are in other packages (and if those packages are
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  and those which are in other packages (and if those packages are
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  specified in the \file{DESCRIPTION} file).  Direct calls to the
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  specified in the \file{DESCRIPTION} file).
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  FORTRAN entry points for LINPACK in \R itself are not reported (but
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  this does not include modifications of LINPACK routines such as
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  \code{dqrls}).
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}
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}
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\value{
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\value{
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  An object of class \code{"checkFF"}, which currently is a list of the
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  An object of class \code{"checkFF"}.
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  (parsed) foreign function calls with a character first argument and
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  no \code{PACKAGE} argument.
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  There is a \code{print} method to display the information contained in
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  There are \code{formaat} and  \code{print} methods to display the
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  such objects.
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  information contained in such objects.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{.C}},
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  \code{\link{.C}},
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  \code{\link{.Fortran}};
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  \code{\link{.Fortran}};
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  \code{\link{Foreign}}.
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  \code{\link{Foreign}}.