embedd: no visible global function definition for 'as.ts'
embedd: no visible global function definition for 'lag'
embedd: no visible global function definition for 'ts.intersect'
false.nearest: no visible global function definition for 'sd'
lyap: no visible global function definition for 'as.ts'
lyap: no visible global function definition for 'tsp'
lyap: no visible global function definition for 'window'
lyap: no visible global function definition for 'lm'
lyap_k: no visible global function definition for 'as.ts'
lyap_k: no visible global function definition for 'ts'
lyap_k: no visible global function definition for 'frequency'
plot.ami: no visible global function definition for 'plot'
plot.ami: no visible global function definition for 'abline'
plot.d2: no visible global function definition for 'plot'
plot.d2: no visible global function definition for 'lines'
plot.false.nearest: no visible global function definition for 'plot'
print.d2: no visible global function definition for 'plot'
recurr: no visible global function definition for 'start'
recurr: no visible global function definition for 'end'
recurr: no visible global function definition for 'window'
recurr: no visible global function definition for 'dist'
recurr: no visible global function definition for 'time'
recurr: no visible global function definition for 'filled.contour'
recurr : <anonymous>: no visible global function definition for 'gray'
sim.cont: no visible global function definition for 'lsoda'
sim.cont: no visible global function definition for 'ts'
stplot: no visible global function definition for 'plot'
stplot: no visible global function definition for 'frequency'
stplot: no visible global function definition for 'lines'
Undefined global functions or variables:
  abline as.ts dist end filled.contour frequency gray lag lines lm
  lsoda plot sd start time ts ts.intersect tsp window
Consider adding
  importFrom("grDevices", "gray")
  importFrom("graphics", "abline", "filled.contour", "lines", "plot")
  importFrom("stats", "as.ts", "dist", "end", "frequency", "lag", "lm",
             "sd", "start", "time", "ts", "ts.intersect", "tsp",
             "window")
to your NAMESPACE file.