.InitClusters: no visible global function definition for 'cov'
.doEllipses: no visible global function definition for 'lines'
.get.Mm.det: no visible global function definition for 'cov'
.get.Mm.eigen: no visible global function definition for 'cov'
.getini: no visible global function definition for 'runif'
.plot.tclust.0: no visible global function definition for 'plot.new'
.plot.tclust.0: no visible global function definition for 'par'
.plot.tclust.0: no visible global function definition for 'points'
.plot.tclust.0: no visible global function definition for 'mtext'
.plot.tclust.0: no visible global function definition for 'box'
.plot.tclust.0: no visible global function definition for 'axis'
.plot.tclust.1d: no visible global function definition for 'runif'
.plot.tclust.1d: no visible global function definition for 'qchisq'
.plot.tclust.2d: no visible global function definition for 'qchisq'
.plot.tclust.title: no visible global function definition for 'title'
.plot.tclust.title: no visible global function definition for 'mtext'
.restr.dir: no visible global function definition for 'rnorm'
.restr.prop: no visible global function definition for 'rnorm'
.tclust.postproc: no visible global function definition for
  'mahalanobis'
.vline: no visible global function definition for 'par'
.vline: no visible global function definition for 'lines'
ctlcurves: no visible global function definition for 'flush.console'
ctlcurves: no visible global function definition for 'qchisq'
discr_coords: no visible global function definition for 'cov'
plot.DiscrFact: no visible global function definition for 'par'
plot.ctlcurves: no visible global function definition for 'mtext'
plot.ctlcurves: no visible global function definition for 'lines'
plot.ctlcurves: no visible global function definition for 'text'
plot_DiscrFact_p2: no visible global function definition for 'axis'
plot_DiscrFact_p2: no visible global function definition for 'abline'
plot_DiscrFact_p2: no visible global function definition for 'box'
plot_DiscrFact_p2: no visible global function definition for 'polygon'
plot_DiscrFact_p2: no visible global function definition for 'par'
plot_DiscrFact_p2: no visible global function definition for 'legend'
plot_DiscrFact_p3: no visible global function definition for 'grey'
Undefined global functions or variables:
  abline axis box cov flush.console grey legend lines mahalanobis mtext
  par plot.new points polygon qchisq rnorm runif text title
Consider adding
  importFrom("grDevices", "grey")
  importFrom("graphics", "abline", "axis", "box", "legend", "lines",
             "mtext", "par", "plot.new", "points", "polygon", "text",
             "title")
  importFrom("stats", "cov", "mahalanobis", "qchisq", "rnorm", "runif")
  importFrom("utils", "flush.console")
to your NAMESPACE file.