comparison.cloud: no visible global function definition for ‘plot.new’
comparison.cloud: no visible global function definition for ‘par’
comparison.cloud: no visible global function definition for
  ‘plot.window’
comparison.cloud: no visible global function definition for ‘strwidth’
comparison.cloud: no visible global function definition for ‘strheight’
comparison.cloud: no visible global function definition for ‘rect’
comparison.cloud: no visible global function definition for ‘text’
comparison.cloud: no visible global function definition for ‘runif’
textplot: no visible global function definition for ‘plot’
textplot: no visible global function definition for ‘points’
textplot: no visible global function definition for ‘lines’
textplot: no visible global function definition for ‘text’
wordcloud: no visible global function definition for ‘Corpus’
wordcloud: no visible global function definition for ‘VectorSource’
wordcloud: no visible global function definition for ‘tm_map’
wordcloud: no visible binding for global variable ‘removePunctuation’
wordcloud : <anonymous>: no visible global function definition for
  ‘removeWords’
wordcloud : <anonymous>: no visible global function definition for
  ‘stopwords’
wordcloud: no visible global function definition for
  ‘TermDocumentMatrix’
wordcloud: no visible global function definition for ‘plot.new’
wordcloud: no visible global function definition for ‘par’
wordcloud: no visible global function definition for ‘plot.window’
wordcloud: no visible global function definition for ‘runif’
wordcloud: no visible global function definition for ‘strwidth’
wordcloud: no visible global function definition for ‘strheight’
wordcloud: no visible global function definition for ‘text’
wordlayout: no visible global function definition for ‘sd’
wordlayout: no visible global function definition for ‘runif’
wordlayout: no visible global function definition for ‘strwidth’
wordlayout: no visible global function definition for ‘strheight’
Undefined global functions or variables:
  Corpus TermDocumentMatrix VectorSource lines par plot plot.new
  plot.window points rect removePunctuation removeWords runif sd
  stopwords strheight strwidth text tm_map
Consider adding
  importFrom("graphics", "lines", "par", "plot", "plot.new",
             "plot.window", "points", "rect", "strheight", "strwidth",
             "text")
  importFrom("stats", "runif", "sd")
to your NAMESPACE file.