LICORS2LSC: no visible global function definition for 'ts'
plot.LSC: no visible global function definition for 'plot.new'
plot_LSC_0plus1D: no visible global function definition for 'loess'
plot_LSC_0plus1D: no visible global function definition for 'matplot'
plot_LSC_1plus1D: no visible global function definition for
  'colorRampPalette'
plot_LSC_1plus1D: no visible global function definition for 'loess'
plot_LSC_1plus1D: no visible global function definition for 'layout'
plot_LSC_1plus1D: no visible global function definition for 'par'
plot_LSC_1plus1D: no visible global function definition for 'lines'
plot_LSC_1plus1D: no visible global function definition for 'box'
plot_LSC_1plus1D: no visible global function definition for 'axis'
plot_LSC_1plus1D: no visible global function definition for 'mtext'
plot_LSC_2plus1D: no visible global function definition for
  'colorRampPalette'
plot_LSC_2plus1D: no visible binding for global variable 'median'
plot_LSC_2plus1D : <anonymous>: no visible global function definition
  for 'sd'
plot_LSC_2plus1D: no visible global function definition for 'par'
plot_LSC_2plus1D: no visible global function definition for 'layout'
plot_LSC_2plus1D: no visible global function definition for 'mtext'
plot_LSC_2plus1D: no visible global function definition for 'plot.new'
plot_LSC_2plus1D: no visible global function definition for 'lines'
plot_LSC_2plus1D: no visible global function definition for 'axis'
plot_LSC_2plus1D: no visible global function definition for 'box'
plot_LSC_2plus1D: no visible global function definition for 'grid'
plot_LSC_2plus1D: no visible global function definition for 'points'
plot_LSC_2plus1D: no visible global function definition for 'abline'
plot_LSC_2plus1D: no visible binding for global variable
  'weighted.mean'
plot_LSC_2plus1D: no visible binding for global variable 'sd'
plot_LSC_2plus1D: no visible global function definition for 'density'
Undefined global functions or variables:
  abline axis box colorRampPalette density grid layout lines loess
  matplot median mtext par plot.new points sd ts weighted.mean
Consider adding
  importFrom("grDevices", "colorRampPalette")
  importFrom("graphics", "abline", "axis", "box", "grid", "layout",
             "lines", "matplot", "mtext", "par", "plot.new", "points")
  importFrom("stats", "density", "loess", "median", "sd", "ts",
             "weighted.mean")
to your NAMESPACE file.