compute.pod: no visible global function definition for 'model.matrix'
iCluster: no visible global function definition for 'kmeans'
iCluster.RI: no visible global function definition for 'median'
iCluster2: no visible global function definition for 'rnorm'
iCluster2: no visible global function definition for 'kmeans'
plotHeatmap: no visible global function definition for 'bluered'
plotHeatmap : my.panel.levelplot: no visible global function definition
  for 'panel.levelplot'
plotHeatmap : my.panel.levelplot: no visible global function definition
  for 'panel.abline'
plotHeatmap: no visible global function definition for 'quantile'
plotHeatmap: no visible global function definition for 'cor'
plotHeatmap: no visible global function definition for 'hclust'
plotHeatmap: no visible global function definition for 'as.dist'
plotHeatmap : my.panel.levelplot.2: no visible global function
  definition for 'panel.levelplot'
plotHeatmap : my.panel.levelplot.2: no visible global function
  definition for 'panel.abline'
plotHeatmap : scale.fn: no visible binding for global variable 'sd'
plotHeatmap: no visible global function definition for 'levelplot'
plotRI: no visible global function definition for 'plot'
plotRI: no visible global function definition for 'axis'
plotiCluster: no visible global function definition for 'image'
plotiCluster: no visible global function definition for 'gray'
plotiCluster: no visible global function definition for 'axis'
plotiCluster: no visible global function definition for 'mtext'
plotiCluster: no visible global function definition for 'box'
predict.kmeans: no visible global function definition for 'dist'
tune.iCluster2: no visible global function definition for 'data'
tune.iCluster2: no visible binding for global variable 'glp'
tune.iCluster2: no visible global function definition for 'mclapply'
Undefined global functions or variables:
  as.dist axis bluered box cor data dist glp gray hclust image kmeans
  levelplot mclapply median model.matrix mtext panel.abline
  panel.levelplot plot quantile rnorm sd
Consider adding
  importFrom("grDevices", "gray")
  importFrom("graphics", "axis", "box", "image", "mtext", "plot")
  importFrom("stats", "as.dist", "cor", "dist", "hclust", "kmeans",
             "median", "model.matrix", "quantile", "rnorm", "sd")
  importFrom("utils", "data")
to your NAMESPACE file.