quanteda (version 2.1.2)

summary_metadata: Functions to add or retrieve corpus summary metadata

Description

Functions to add or retrieve corpus summary metadata

Usage

add_summary_metadata(x, extended = FALSE, ...)
get_summary_metadata(x, ...)
summarize_texts_extended(x, stop_words = stopwords("en"), n = 100)

Arguments

x

corpus object

...

additional arguments passed to tokens() when computing the summary information

Value

add_summary_metadata() returns a corpus with summary metadata added as a data.frame, with the top-level list element names summary.

get_summary_metadata() returns the summary metadata as a data.frame.

summarize_texts_extended() returns extended summary information.

Details

This is provided so that a corpus object can be stored with summary information to avoid having to compute this every time [summary.corpus()] is called.

So in future calls, if !is.null(meta(x, "summary", type = "system") && !length(list(...)), then summary.corpus() will simply return get_system_meta() rather than compute the summary statistics on the fly, which requires tokenizing the text.

Examples

# NOT RUN {
corp <- corpus(data_char_ukimmig2010)
corp <- quanteda:::add_summary_metadata(corp)
quanteda:::get_summary_metadata(corp)

# }
# NOT RUN {
# using extended summary

extended_data <- quanteda:::summarize_texts_extended(data_corpus_inaugural)

textplot_wordcloud(extended_data$top_dfm, max_words = 100)

library("ggplot2")
ggplot(data.frame(all_tokens = extended_data$all_tokens), aes(x = all_tokens)) +
   geom_histogram(color = "darkblue", fill = "lightblue") +
   xlab("Total length in tokens")
# }

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