.calcSSAAllMethods: no visible global function definition for
  'sessionInfo'
.calcSSAAllMethods: no visible global function definition for
  'dump.frames'
.decomposeNcdfCoreprocess: no visible global function definition for
  'sessionInfo'
.decomposeNcdfCoreprocess: no visible global function definition for
  'dump.frames'
.gapfillSSACenterSeries: no visible global function definition for 'sd'
.gapfillSSACheckInput: no visible global function definition for
  'na.omit'
.gapfillSSAInsertGaps: no visible global function definition for
  'runif'
.gapfillSSAPlot: no visible global function definition for 'layout'
.gapfillSSAPlot: no visible global function definition for 'par'
.gapfillSSAPlot: no visible global function definition for 'image'
.gapfillSSAPlot: no visible global function definition for 'gray'
.gapfillSSAPlot: no visible global function definition for 'box'
.gapfillSSAPlot: no visible global function definition for 'axis'
.gapfillSSAPlot: no visible global function definition for 'mtext'
.gapfillSSAPlot: no visible global function definition for 'points'
.gapfillSSAPlot: no visible global function definition for 'legend'
.gapfillSSAPlot: no visible global function definition for 'plot.new'
.identifyValidCellsSSA: no visible binding for global variable 'median'
.identifyValidCellsSSA: no visible global function definition for
  'rnorm'
calcFrequency: no visible global function definition for 'fft'
calcFrequency: no visible global function definition for 'dev.new'
calcFrequency: no visible global function definition for 'plot'
calcFrequency: no visible global function definition for 'abline'
calcFrequency: no visible global function definition for 'text'
calcFrequency: no visible global function definition for 'par'
calcFrequency: no visible global function definition for 'axTicks'
calcFrequency: no visible global function definition for 'axis'
calcFrequency: no visible global function definition for 'mtext'
decomposeNcdf: no visible global function definition for 'na.omit'
filterTSeriesSSA: no visible global function definition for 'layout'
filterTSeriesSSA: no visible global function definition for 'par'
filterTSeriesSSA: no visible global function definition for 'var'
filterTSeriesSSA: no visible global function definition for 'spectrum'
filterTSeriesSSA: no visible global function definition for 'plot'
filterTSeriesSSA: no visible global function definition for 'axis'
filterTSeriesSSA: no visible global function definition for 'rainbow'
filterTSeriesSSA: no visible global function definition for 'polygon'
filterTSeriesSSA: no visible global function definition for 'abline'
filterTSeriesSSA: no visible global function definition for 'points'
filterTSeriesSSA: no visible global function definition for 'mtext'
filterTSeriesSSA: no visible global function definition for 'text'
filterTSeriesSSA: no visible global function definition for 'legend'
gapfillNcdf: no visible global function definition for 'var'
gapfillNcdfCoreprocess: no visible global function definition for
  'sessionInfo'
gapfillNcdfCoreprocess: no visible global function definition for
  'dump.frames'
gapfillSSA: no visible global function definition for
  'colorRampPalette'
gapfillSSA: no visible global function definition for 'dump.frames'
gapfillSSA: no visible global function definition for 'dev.new'
gapfillSSA: no visible global function definition for 'plot'
gapfillSSA: no visible global function definition for 'points'
gapfillSSA: no visible global function definition for 'sd'
groupSSANearestNeighbour: no visible global function definition for
  'dist'
plotAdditionalAxis: no visible global function definition for 'axTicks'
plotAdditionalAxis: no visible global function definition for 'axis'
plotAdditionalAxis: no visible global function definition for 'mtext'
plotDecompSeries: no visible global function definition for 'na.omit'
plotDecompSeries: no visible global function definition for 'dev.cur'
plotDecompSeries: no visible global function definition for 'dev.new'
plotDecompSeries: no visible global function definition for 'png'
plotDecompSeries: no visible global function definition for 'layout'
plotDecompSeries: no visible global function definition for 'par'
plotDecompSeries: no visible global function definition for 'plot.new'
plotDecompSeries: no visible global function definition for 'mtext'
plotDecompSeries: no visible global function definition for 'plot'
plotDecompSeries: no visible global function definition for 'abline'
plotDecompSeries: no visible global function definition for 'points'
plotDecompSeries: no visible global function definition for 'text'
plotDecompSeries: no visible global function definition for 'dev.off'
plotDecomposition: no visible global function definition for 'layout'
plotDecomposition: no visible global function definition for 'par'
plotDecomposition: no visible global function definition for 'plot'
plotDecomposition: no visible global function definition for 'legend'
plotDecomposition: no visible global function definition for 'points'
plotDecomposition: no visible global function definition for 'abline'
plotDecomposition: no visible global function definition for 'axis'
plotDecomposition: no visible global function definition for 'mtext'
plotGapfillCube: no visible global function definition for 'runif'
plotGapfillCube: no visible global function definition for
  'colorRampPalette'
plotGapfillCube: no visible global function definition for 'dev.cur'
plotGapfillCube: no visible global function definition for 'dev.new'
plotGapfillCube: no visible global function definition for 'layout'
plotGapfillCube: no visible global function definition for 'par'
plotGapfillCube: no visible global function definition for 'plot.new'
plotGapfillCube: no visible global function definition for 'hist'
plotGapfillCube: no visible global function definition for 'rgb'
plotGapfillCube: no visible global function definition for 'plot'
plotGapfillCube: no visible global function definition for 'box'
plotGapfillCube: no visible global function definition for 'text'
plotGapfillCube: no visible global function definition for 'mtext'
plotGapfillCube: no visible global function definition for 'points'
plotGapfillSeries: no visible global function definition for 'dev.cur'
plotGapfillSeries: no visible global function definition for 'dev.new'
plotGapfillSeries: no visible global function definition for 'layout'
plotGapfillSeries: no visible global function definition for 'par'
plotGapfillSeries: no visible global function definition for 'plot.new'
plotGapfillSeries: no visible global function definition for 'text'
plotGapfillSeries: no visible global function definition for 'hist'
plotGapfillSeries: no visible global function definition for 'rgb'
plotGapfillSeries: no visible global function definition for 'plot'
plotGapfillSeries: no visible global function definition for 'box'
plotGapfillSeries: no visible global function definition for 'points'
plotGapfillSeries: no visible global function definition for
  'aggregate'
plotGapfillSeries: no visible global function definition for 'abline'
plotPseudospectrum: no visible global function definition for 'var'
plotPseudospectrum: no visible global function definition for 'par'
plotPseudospectrum: no visible global function definition for
  'spectrum'
plotPseudospectrum: no visible global function definition for 'plot'
plotPseudospectrum: no visible global function definition for 'axis'
plotPseudospectrum: no visible global function definition for 'mtext'
plotPseudospectrum: no visible global function definition for 'points'
plotPseudospectrum: no visible global function definition for 'axTicks'
plotPseudospectrum: no visible global function definition for 'text'
plotPseudospectrum: no visible global function definition for 'abline'
plotPseudospectrum: no visible global function definition for 'legend'
Undefined global functions or variables:
  abline aggregate axTicks axis box colorRampPalette dev.cur dev.new
  dev.off dist dump.frames fft gray hist image layout legend median
  mtext na.omit par plot plot.new png points polygon rainbow rgb rnorm
  runif sd sessionInfo spectrum text var
Consider adding
  importFrom("grDevices", "colorRampPalette", "dev.cur", "dev.new",
             "dev.off", "gray", "png", "rainbow", "rgb")
  importFrom("graphics", "abline", "axTicks", "axis", "box", "hist",
             "image", "layout", "legend", "mtext", "par", "plot",
             "plot.new", "points", "polygon", "text")
  importFrom("stats", "aggregate", "dist", "fft", "median", "na.omit",
             "rnorm", "runif", "sd", "spectrum", "var")
  importFrom("utils", "dump.frames", "sessionInfo")
to your NAMESPACE file.