bedplot: no visible global function definition for 'read.table'
bedplot: no visible global function definition for 'write.table'
genomeplot: no visible global function definition for 'read.table'
genomeplot: no visible global function definition for 'write.table'
nplplot: no visible global function definition for 'read.table'
nplplot: no visible global function definition for 'abline'
nplplot: no visible global function definition for 'rainbow'
nplplot: no visible global function definition for 'points'
nplplot: no visible global function definition for 'lines'
nplplot: no visible global function definition for 'par'
nplplot: no visible global function definition for 'axis'
nplplot: no visible global function definition for 'legend'
nplplot.multi: no visible global function definition for 'dev.cur'
nplplot.multi: no visible global function definition for 'postscript'
nplplot.multi: no visible global function definition for 'pdf'
nplplot.multi: no visible global function definition for 'par'
nplplot.multi: no visible global function definition for 'dev.off'
nplplot.old: no visible global function definition for 'par'
nplplot.old: no visible global function definition for 'dev.off'
nplplot.old: no visible global function definition for 'dev.list'
nplplot.old: no visible global function definition for 'postscript'
nplplot.old: no visible global function definition for 'pdf'
nplplot.old: no visible global function definition for 'read.table'
nplplot.old: no visible global function definition for 'abline'
nplplot.old: no visible global function definition for 'title'
nplplot.old: no visible global function definition for 'points'
nplplot.old: no visible global function definition for 'lines'
nplplot.old: no visible global function definition for 'legend'
nplplot.old: no visible global function definition for 'axis'
prepareplot: no visible global function definition for 'read.table'
prepareplot: no visible global function definition for 'approxfun'
prepareplot: no visible global function definition for 'write.table'
Undefined global functions or variables:
  abline approxfun axis dev.cur dev.list dev.off legend lines par pdf
  points postscript rainbow read.table title write.table
Consider adding
  importFrom("grDevices", "dev.cur", "dev.list", "dev.off", "pdf",
             "postscript", "rainbow")
  importFrom("graphics", "abline", "axis", "legend", "lines", "par",
             "points", "title")
  importFrom("stats", "approxfun")
  importFrom("utils", "read.table", "write.table")
to your NAMESPACE file.