Context class. — context-class • polmineR

Class to organize information of context analysis.

# S4 method for context
length(x)

# S4 method for context
p_attributes(.Object)

# S4 method for context
count(.Object)

# S4 method for context
sample(x, size)

# S4 method for context
enrich(
  .Object,
  s_attribute = NULL,
  p_attribute = NULL,
  decode = FALSE,
  verbose = TRUE,
  ...
)

# S4 method for context
as.regions(x, node = TRUE)

# S4 method for context
trim(
  object,
  s_attribute = NULL,
  positivelist = NULL,
  p_attribute = p_attributes(object),
  regex = FALSE,
  stoplist = NULL,
  verbose = TRUE,
  progress = TRUE,
  ...
)

Arguments

x	a context object
.Object	object
size	integer indicating sample size
s_attribute	s-attribute(s) to add to data.table in cpos-slot
p_attribute	p-attribute(s) to add to data.table in cpos-slot
decode	logical, whether to convert integer ids to expressive strings
verbose	logical, whether to be talkative
...	to maintain backwards compatibility if argument `pAttribute` is still used
node	A logical value, whether to include the node (i.e. query matches) in the region matrix generated when creating a `partition` from a `context`-object.
object	a context object
positivelist	tokens that are required to be present to keep a match
regex	logical, whether positivlist / stoplist is interpreted as regular expressions
stoplist	tokens that are used to exclude a match
progress	logical, whether to show progress bar

Details

Objects of the class context include a data.table in the slot cpos. The data.table will at least include the columns "match_id", "cpos" and "position".

The length-method will return the number of hits that were achieved.

The enrich-method can be used to add additional information to the data.table in the "cpos"-slot of a context-object.

Slots

query: The query examined (character).
count: An integer value, the number of hits for the query.
partition: The partition the context object is based on.
size_partition: The size of the partition, a length-one integer vector.
left: A length-one integer value, the number of tokens to the left of the query match.
right: An integer value, the number of tokens to the right of the query match.
size: A length-one integer value, the number of tokens covered by the context-object, i.e. the number of tokens in the right and left context of the node as well as query matches.
size_match: A length-one integer value, the number of tokens matches by the query. Identical with the value in slot count if the query is not a CQP query.
size_coi: A length-one integer value, the number of tokens in the right and left context of the node (excluding query matches).
size_ref: A length-one integer value, the number of tokens in the partition, without tokens matched and the tokens in the left and right context.
boundary: An s-attribute (character).
p_attribute: The p-attribute of the query (character).
corpus: The CWB corpus used (character).
stat: A data.table, the statistics of the analysis.
encoding: Object of class character, encoding of the corpus.
cpos: A data.table, with the columns match_id, cpos, position, word_id.
method: A character-vector, statistical test used.
call: Object of class character, call that generated the object.