Word clouds in Shiny

Case Studies: Building Web Applications with Shiny in R

Dean Attali

Shiny Consultant

Word clouds

Visual representation of text
BIG WORDS = COMMON, small words = rare

chapter4_1_word_clouds_in_shiny.003.png

Word clouds in R - function

Created by your friend:

create_wordcloud(data, num_words = 100, background = "white")

data: text to use in word cloud
- Single string:
  - data = "Some very long story"
- List of strings:
  - data = c("Some very", "long story")
num_words: maximum number of words
background: background color

Word clouds in R - usage

us_constitution <- "We the People of the United States, ..."

create_wordcloud(data = us_constitution,
                 num_words = 15,
                 background = "yellow")

chapter4_1_word_clouds_in_shiny.012.png

Word clouds: from R to Shiny

create_wordcloud() requires R knowledge to use
Create Shiny app ⇒ anyone can create a word cloud

Word clouds in Shiny

chapter4_1_word_clouds_in_shiny.016.png

Word clouds are new type of output
wordcloud2Output() + renderWordcloud2()

Let's practice!

Case Studies: Building Web Applications with Shiny in R