cover: no visible global function definition for ‘par’
cover: no visible global function definition for ‘text’
cover: no visible global function definition for ‘rect’
cover: no visible global function definition for ‘locator’
identity : num.display: no visible global function definition for
  ‘rect’
identity : num.display: no visible global function definition for
  ‘text’
identity : num.display: no visible global function definition for
  ‘locator’
identity: no visible global function definition for ‘par’
identity: no visible global function definition for ‘text’
identity: no visible global function definition for ‘read.table’
read.write: no visible global function definition for ‘read.table’
read.write : <anonymous>: no visible global function definition for
  ‘write.table’
read.write: no visible global function definition for ‘write.table’
slide : Annex: no visible global function definition for ‘rect’
slide : Annex: no visible global function definition for ‘text’
slide : Annex: no visible global function definition for ‘lines’
slide : Annex: no visible global function definition for ‘points’
slide : num.display: no visible global function definition for ‘rect’
slide : num.display: no visible global function definition for ‘text’
slide : num.display: no visible global function definition for
  ‘locator’
slide: no visible global function definition for ‘close.screen’
slide: no visible global function definition for ‘split.screen’
slide: no visible global function definition for ‘screen’
slide: no visible global function definition for ‘par’
slide: no visible global function definition for ‘text’
slide: no visible global function definition for ‘rect’
slide: no visible global function definition for ‘locator’
slide: no visible global function definition for ‘lines’
Undefined global functions or variables:
  close.screen lines locator par points read.table rect screen
  split.screen text write.table
Consider adding
  importFrom("graphics", "close.screen", "lines", "locator", "par",
             "points", "rect", "screen", "split.screen", "text")
  importFrom("utils", "read.table", "write.table")
to your NAMESPACE file.