adjacent: no visible global function definition for 'col2rgb'
anagrams: no visible global function definition for 'rgb2hsv'
anagrams: no visible global function definition for 'col2rgb'
anagrams: no visible global function definition for 'hsv'
col2HSV: no visible global function definition for 'col2rgb'
col2HSV: no visible global function definition for 'rgb2hsv'
col2HSV: no visible global function definition for 'hsv'
complementary: no visible global function definition for 'col2rgb'
pals: no visible global function definition for 'par'
pals: no visible global function definition for 'plot'
pals: no visible global function definition for 'rect'
pals: no visible global function definition for 'col2rgb'
pals: no visible global function definition for 'mtext'
pizza: no visible global function definition for 'col2rgb'
pizza: no visible global function definition for 'par'
pizza: no visible global function definition for 'plot.new'
pizza: no visible global function definition for 'dev.hold'
pizza: no visible global function definition for 'dev.flush'
pizza: no visible global function definition for 'plot.window'
pizza: no visible global function definition for 'polygon'
pizza: no visible global function definition for 'lines'
pizza: no visible global function definition for 'text'
sequential: no visible global function definition for 'rgb2hsv'
sequential: no visible global function definition for 'col2rgb'
sequential: no visible global function definition for 'hsv'
sequential: no visible global function definition for 'rect'
sequential: no visible global function definition for 'mtext'
sequential: no visible global function definition for 'title'
setColors: no visible global function definition for 'col2rgb'
setColors: no visible global function definition for 'rgb2hsv'
setColors: no visible global function definition for 'hsv'
splitComp: no visible global function definition for 'col2rgb'
square: no visible global function definition for 'col2rgb'
tetradic: no visible global function definition for 'col2rgb'
triadic: no visible global function definition for 'col2rgb'
wheel: no visible global function definition for 'col2rgb'
wheel: no visible global function definition for 'par'
wheel: no visible global function definition for 'plot.new'
wheel: no visible global function definition for 'dev.hold'
wheel: no visible global function definition for 'dev.flush'
wheel: no visible global function definition for 'plot.window'
wheel: no visible global function definition for 'polygon'
wheel: no visible global function definition for 'lines'
wheel: no visible global function definition for 'text'
wheel: no visible global function definition for 'title'
Undefined global functions or variables:
  col2rgb dev.flush dev.hold hsv lines mtext par plot plot.new
  plot.window polygon rect rgb2hsv text title
Consider adding
  importFrom("grDevices", "col2rgb", "dev.flush", "dev.hold", "hsv",
             "rgb2hsv")
  importFrom("graphics", "lines", "mtext", "par", "plot", "plot.new",
             "plot.window", "polygon", "rect", "text", "title")
to your NAMESPACE file.