.drawSamples: no visible global function definition for ‘lines’
.drawSamples: no visible global function definition for ‘points’
.drawShading: no visible global function definition for ‘col2rgb’
.drawShading: no visible global function definition for ‘lines’
.drawShading: no visible global function definition for ‘rgb’
.drawShading: no visible global function definition for ‘polygon’
.ggplotcolors: no visible global function definition for ‘hcl’
.interpolate: no visible global function definition for ‘predict’
.interpolate: no visible global function definition for ‘smooth.spline’
.learnnoise: no visible binding for global variable ‘var’
.optimize_dynamic: no visible global function definition for ‘optim’
.optimize_expected: no visible global function definition for ‘optim’
.optimize_static: no visible global function definition for ‘optim’
.plotls: no visible global function definition for ‘par’
.plotls: no visible global function definition for ‘plot’
.plotls: no visible global function definition for ‘axis’
.plotls: no visible global function definition for ‘mtext’
.randparams: no visible global function definition for ‘runif’
gpr1sample: no visible global function definition for ‘sd’
gpr_posterior: no visible global function definition for ‘sd’
plot.gp: no visible global function definition for ‘hasArg’
plot.gp: no visible global function definition for ‘plot’
plot.gp: no visible global function definition for ‘mtext’
plot.gp: no visible global function definition for ‘lines’
plot.gp: no visible global function definition for ‘points’
plot.gppack: no visible global function definition for ‘hasArg’
plot.gppack: no visible global function definition for ‘layout’
plot.gppack: no visible global function definition for ‘par’
plot.gppack: no visible global function definition for ‘plot’
plot.gppack: no visible global function definition for ‘mtext’
plot.gppack: no visible global function definition for ‘axis’
plot.gppack: no visible global function definition for ‘lines’
plot.gppack: no visible global function definition for ‘polygon’
plot.gppack: no visible global function definition for ‘rgb’
plot.gppack: no visible global function definition for ‘points’
plot.gpsimple: no visible global function definition for ‘hasArg’
plot.gpsimple: no visible global function definition for ‘plot’
plot.gpsimple: no visible global function definition for ‘mtext’
plot.gpsimple: no visible global function definition for ‘lines’
plot.gpsimple: no visible global function definition for ‘points’
plotdistr: no visible global function definition for ‘dgamma’
plotdistr: no visible global function definition for ‘par’
plotdistr: no visible global function definition for ‘plot’
simgp_clust: no visible global function definition for ‘rgamma’
simgp_clust: no visible global function definition for ‘runif’
simgp_clust: no visible global function definition for ‘plot’
simgp_clust: no visible global function definition for ‘lines’
simulategp: no visible global function definition for ‘rgamma’
simulategp.perturbed : draw.lmax: no visible global function definition
  for ‘rgamma’
simulategp.perturbed : draw.lmin: no visible global function definition
  for ‘runif’
simulategp.perturbed : draw.sigmaf: no visible global function
  definition for ‘rgamma’
simulategp.perturbed : draw.a: no visible global function definition
  for ‘runif’
simulategp.perturbed : draw.b: no visible global function definition
  for ‘runif’
simulategp.perturbed : draw.c: no visible global function definition
  for ‘runif’
Undefined global functions or variables:
  axis col2rgb dgamma hasArg hcl layout lines mtext optim par plot
  points polygon predict rgamma rgb runif sd smooth.spline var
Consider adding
  importFrom("grDevices", "col2rgb", "hcl", "rgb")
  importFrom("graphics", "axis", "layout", "lines", "mtext", "par",
             "plot", "points", "polygon")
  importFrom("methods", "hasArg")
  importFrom("stats", "dgamma", "optim", "predict", "rgamma", "runif",
             "sd", "smooth.spline", "var")
to your NAMESPACE file (and ensure that your DESCRIPTION Imports field
contains 'methods').