For a text or a collection of texts (in a quanteda corpus object), return a list of a keyword supplied by the user in its immediate context, identifying the source text and the word index number within the source text. (Not the line number, since the text may or may not be segmented using end-of-line delimiters.)
kwic(x, pattern, window = 5, valuetype = c("glob", "regex", "fixed"), case_insensitive = TRUE, ...) is.kwic(x)
x | |
---|---|
pattern | a character vector, list of character vectors, dictionary, collocations, or dfm. See pattern for details. |
window | the number of context words to be displayed around the keyword. |
valuetype | the type of pattern matching: |
case_insensitive | match without respect to case if |
... | additional arguments passed to tokens, for applicable object types |
A kwic
classed data.frame, with the document name
(docname
), the token index positions (from
and to
,
which will be the same for single-word patterns, or a sequence equal in
length to the number of elements for multi-word phrases), the context
before (pre
), the keyword in its original format (keyword
,
preserving case and attached punctuation), and the context after
(post
). The return object has its own print
method, plus
some special attributes that are hidden in the print view. If you want to
turn this into a simple data.frame, simply wrap the result in
data.frame
.
pattern
will be a keyword pattern or phrase, possibly multiple
patterns, that may include punctuation. If a pattern contains whitespace,
it is best to wrap it in phrase
to make this explicit.
However if pattern
is a collocations
or dictionary object, then the collocations or multi-word dictionary
keys will automatically be considered phrases where each
whitespace-separated element matches a token in sequence.
head(kwic(data_corpus_inaugural, "secure*", window = 3, valuetype = "glob"))#> #> [1797-Adams, 479] welfare, and | secure | the blessings of #> [1797-Adams, 1513] nations, and | secured | immortal glory with #> [1805-Jefferson, 2368] , and shall | secure | to you the #> [1817-Monroe, 1755] cherished. To | secure | us against these #> [1817-Monroe, 1815] defense as to | secure | our cities and #> [1817-Monroe, 3012] I can to | secure | economy and fidelityhead(kwic(data_corpus_inaugural, "secur", window = 3, valuetype = "regex"))#> #> [1789-Washington, 1497] government for the | security | of their union #> [1797-Adams, 479] welfare, and | secure | the blessings of #> [1797-Adams, 1513] nations, and | secured | immortal glory with #> [1805-Jefferson, 2368] , and shall | secure | to you the #> [1813-Madison, 321] seas and the | security | of an important #> [1817-Monroe, 1610] may form some | security | against these dangershead(kwic(data_corpus_inaugural, "security", window = 3, valuetype = "fixed"))#> #> [1789-Washington, 1497] government for the | security | #> [1813-Madison, 321] seas and the | security | #> [1817-Monroe, 1610] may form some | security | #> [1817-Monroe, 3430] and as a | security | #> [1825-Adams, 1371] that the best | security | #> [1825-Adams, 1443] that the firmest | security | #> #> of their union #> of an important #> against these dangers #> against foreign dangers #> for the beneficence #> of peace is#> #> [1857-Buchanan, 2913:2914] advantage of the fortune of | war against | #> [1901-McKinley, 2272:2273] . We are not waging | war against | #> [1901-McKinley, 2287:2288] portion of them are making | war against | #> [1901-McKinley, 2401:2402] used when those who make | war against | #> [1933-Roosevelt, 1849:1850] Executive power to wage a | war against | #> #> a sister republic, we #> the inhabitants of the Philippine #> the United States. By #> us shall make it no #> the emergency, as great#> #> [1801-Jefferson, 1271:1272] domestic concerns and the surest | #> [1845-Polk, 690:691] domestic concerns and the surest | #> [1857-Buchanan, 2913:2914] advantage of the fortune of | #> [1901-McKinley, 2272:2273] . We are not waging | #> [1901-McKinley, 2287:2288] portion of them are making | #> [1901-McKinley, 2401:2402] used when those who make | #> [1933-Roosevelt, 1849:1850] Executive power to wage a | #> [1977-Carter, 927:928] and we will fight our | #> #> bulwarks against | antirepublican tendencies; the preservation #> bulwark against | antirepublican tendencies," and #> war against | a sister republic, we #> war against | the inhabitants of the Philippine #> war against | the United States. By #> war against | us shall make it no #> war against | the emergency, as great #> wars against | poverty, ignorance, andmykwic <- kwic(data_corpus_inaugural, "provident*") is.kwic(mykwic)#> [1] TRUEis.kwic("Not a kwic")#> [1] FALSE