generateMonochromaticColors: no visible global function definition for
  'col2rgb'
generateMonochromaticColors: no visible global function definition for
  'rgb'
generateMonochromaticColors: no visible global function definition for
  'tail'
hsv2rgb: no visible global function definition for 'rgb'
rotational_dispersion: no visible global function definition for
  'col2rgb'
rotational_dispersion: no visible global function definition for
  'rgb2hsv'
tetradicColors: no visible global function definition for 'head'
triadicColors: no visible global function definition for 'head'
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  'col2rgb'
generateMonochromaticColors: no visible global function definition for
  'rgb'
generateMonochromaticColors: no visible global function definition for
  'tail'
hsv2rgb: no visible global function definition for 'rgb'
rotational_dispersion: no visible global function definition for
  'col2rgb'
rotational_dispersion: no visible global function definition for
  'rgb2hsv'
tetradicColors: no visible global function definition for 'head'
triadicColors: no visible global function definition for 'head'
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  'col2rgb'
generateMonochromaticColors: no visible global function definition for
  'rgb'
generateMonochromaticColors: no visible global function definition for
  'tail'
hsv2rgb: no visible global function definition for 'rgb'
rotational_dispersion: no visible global function definition for
  'col2rgb'
rotational_dispersion: no visible global function definition for
  'rgb2hsv'
tetradicColors: no visible global function definition for 'head'
triadicColors: no visible global function definition for 'head'
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  ‘col2rgb’
generateMonochromaticColors: no visible global function definition for
  ‘rgb’
generateMonochromaticColors: no visible global function definition for
  ‘tail’
hsv2rgb: no visible global function definition for ‘rgb’
rotational_dispersion: no visible global function definition for
  ‘col2rgb’
rotational_dispersion: no visible global function definition for
  ‘rgb2hsv’
tetradicColors: no visible global function definition for ‘head’
triadicColors: no visible global function definition for ‘head’
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory
generateMonochromaticColors: no visible global function definition for
  'col2rgb'
generateMonochromaticColors: no visible global function definition for
  'rgb'
generateMonochromaticColors: no visible global function definition for
  'tail'
hsv2rgb: no visible global function definition for 'rgb'
rotational_dispersion: no visible global function definition for
  'col2rgb'
rotational_dispersion: no visible global function definition for
  'rgb2hsv'
tetradicColors: no visible global function definition for 'head'
triadicColors: no visible global function definition for 'head'
Undefined global functions or variables:
  col2rgb head rgb rgb2hsv tail
Consider adding
  importFrom("grDevices", "col2rgb", "rgb", "rgb2hsv")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.
'LazyData' is specified without a 'data' directory