A reference class for storing and accessing data frames stored on disk.
A data frame.
Path to the file storing the data on disk. Default stores in the temporary directory.
An FDF object has many field:
$address: address of the external pointer containing the underlying
C++ object, to be used as a
XPtr<FDF> in C++ code
$backingfile: File that stores the numeric data of the FDF
$rds: 'rds' file (that may not exist) in which this object is stored
$is_saved: whether this object stored in
$ind_row: Indices of rows for a subview of the FDF
$ind_col: Indices of columns for a subview view of the FDF
$strings: 2^16 strings to match with integers (between 0 and 65535)
$nstr: Number of unique strings already matched with an integer
$groups: Tibble with position indices of
$ind_row for each group.
$meta: Meta information for factors, dates and character vectors.
And some methods:
$save(): Save the FDF object in
$rds. Returns the FDF.
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