quanteda (version 1.3.4)

textplot_wordcloud: Plot features as a wordcloud

Description

Plot a dfm object as a wordcloud, where the feature labels are plotted with their sizes proportional to their numerical values in the dfm. When comparison = TRUE, it plots comparison word clouds by document.

Usage

textplot_wordcloud(x, min_size = 0.5, max_size = 4, min_count = 3,
  max_words = 500, color = "darkblue", font = NULL, adjust = 0,
  rotation = 0.1, random_order = FALSE, random_color = FALSE,
  ordered_color = FALSE, labelcolor = "gray20", labelsize = 1.5,
  labeloffset = 0, fixed_aspect = TRUE, ..., comparison = FALSE)

Arguments

x

a dfm object

min_size

size of the smallest word

max_size

size of the largest word

min_count

words with frequency below min_count will not be plotted

max_words

maximum number of words to be plotted. least frequent terms dropped.

color

color of words from least to most frequent

font

font-family of words and labels. Use default font if NULL.

adjust

ajust sizes of words by a constant. Useful for non-Engish words for which R fails to obtain correct sizes.

rotation

proportion of words with 90 degree rotation

random_order

plot words in random order. If FALSE, they will be plotted in decreasing frequency.

random_color

choose colors randomly from the colors. If FALSE, the color is chosen based on the frequency

ordered_color

if TRUE, then colors are assigned to words in order.

labelcolor

color of group labels. Only used when compariosn=TRUE.

labelsize

size of group labels. Only used when compariosn=TRUE.

labeloffset

position of group labels. Only used when comparison=TRUE.

fixed_aspect

if TRUE, the aspect ratio is fixed. Variable aspect ratio only supported if rotation = 0.

...

additional parameters. Only used to make it compatible with wordcloud

comparison

if TRUE, plot a wordclound that compares documents in the same way as comparison.cloud

Details

The default is to plot the word cloud of all features, summed across documents. To produce word cloud plots for specific document or set of documents, you need to slice out the document(s) from the dfm object.

Comparison wordcloud plots may be plotted by setting comparison = TRUE, which plots a separate grouping for each document in the dfm. This means that you will need to slice out just a few documents from the dfm, or to create a dfm where the "documents" represent a subset or a grouping of documents by some document variable.

Examples

# NOT RUN {
# plot the features (without stopwords) from Obama's inaugural addresses
set.seed(10)
obama_dfm <- 
    dfm(corpus_subset(data_corpus_inaugural, President == "Obama"),
        remove = stopwords("english"), remove_punct = TRUE) %>%
    dfm_trim(min_termfreq = 3)
    
# basic wordcloud
textplot_wordcloud(obama_dfm)

# plot in colors with some additional options
textplot_wordcloud(obama_dfm, rotation = 0.25, 
                   color = rev(RColorBrewer::brewer.pal(10, "RdBu")))
  
# other display options
col <- sapply(seq(0.1, 1, 0.1), function(x) adjustcolor("#1F78B4", x))
textplot_wordcloud(obama_dfm, adjust = 0.5, random_order = FALSE, 
                   color = col, rotation = FALSE)
  
# comparison plot of Obama v. Trump
obama_trump_dfm <- 
    dfm(corpus_subset(data_corpus_inaugural, President %in% c("Obama", "Trump")),
        remove = stopwords("english"), remove_punct = TRUE, groups = "President") %>%
    dfm_trim(min_termfreq = 3)

textplot_wordcloud(obama_trump_dfm, comparison = TRUE, max_words = 300,
                   color = c("blue", "red"))
# }