DocDataFrame object wraps a
data.frame in a
document-oriented interface that is shared with
DocList. This is mostly to achieve an abstraction
around tabular and list representations of
DocDataFrame should behave just like a
data.frame, except it adds the accessors described below.
These are some accessors that
DocDataFrame adds on top of the
basic data frame accessors. Using these accessors allows code to be
agnostic to whether the data are stored as a list or data.frame.
ndoc(x): Gets the number of documents (rows)
nfield(x): Gets the number of fields (columns)
ids(x), ids(x) <- value: Gets or sets the document unique
identifiers (may be
NULL, treated as rownames)
fieldNames(x, includeStatic=TRUE, ...): Gets the field
docs(x): Just returns
represents a set of documents
meta(x): Gets an auxillary data.frame of “meta”
columns that hold fields that describe, rather than compose, the
documents. This feature should be considered unstable. Stay away
unmeta(x): Clears the metadata.
DocList for representing a document collection as
a list instead of a table
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