calcInterval.CD: no visible global function definition for 'approx'
calcInterval.CD: no visible global function definition for 'quantile'
calcInterval.Mult: no visible global function definition for 'approx'
calcInterval.Mult: no visible global function definition for 'quantile'
calcInterval.Sing: no visible global function definition for 'approx'
calcInterval.Sing: no visible global function definition for 'quantile'
crackRmc.CD: no visible global function definition for 'approx'
crackRmc.CD: no visible global function definition for 'runif'
crackRmc.Mult: no visible global function definition for 'approx'
crackRmc.Mult: no visible global function definition for 'runif'
crackRmc.Sing: no visible global function definition for 'approx'
crackRmc.Sing: no visible global function definition for 'runif'
head.CD: no visible global function definition for 'head'
head.Mult: no visible global function definition for 'head'
head.Sing: no visible global function definition for 'head'
head.crackRparallel: no visible global function definition for 'head'
head.crackRresults: no visible global function definition for 'head'
head.parametersCD: no visible global function definition for 'head'
head.parametersMult: no visible global function definition for 'head'
head.parametersSing: no visible global function definition for 'head'
head.stateCD: no visible global function definition for 'head'
head.stateMult: no visible global function definition for 'head'
head.stateSing: no visible global function definition for 'head'
inspection.Mult : <anonymous>: no visible global function definition
  for 'quantile'
inspection.Sing : <anonymous>: no visible global function definition
  for 'quantile'
lines.CD: no visible global function definition for 'lines'
lines.Mult: no visible global function definition for 'lines'
lines.Sing: no visible global function definition for 'lines'
lines.crackRparallel: no visible global function definition for 'lines'
lines.crackRresults: no visible global function definition for 'lines'
lognormalPOD: no visible global function definition for 'plnorm'
plot.CD: no visible global function definition for 'plot'
plot.CD: no visible global function definition for 'lines'
plot.CD: no visible global function definition for 'legend'
plot.Mult: no visible global function definition for 'plot'
plot.Mult: no visible global function definition for 'lines'
plot.Mult: no visible global function definition for 'legend'
plot.Sing: no visible global function definition for 'plot'
plot.Sing: no visible global function definition for 'lines'
plot.Sing: no visible global function definition for 'legend'
plot.crackRparallel: no visible global function definition for 'lines'
plot.crackRparallel: no visible global function definition for 'mtext'
plot.crackRparallel: no visible global function definition for 'abline'
plot.crackRresults: no visible global function definition for 'par'
plot.crackRresults: no visible global function definition for 'plot'
plot.crackRresults: no visible global function definition for 'box'
plot.crackRresults: no visible global function definition for 'axis'
plot.crackRresults: no visible global function definition for 'mtext'
plot.crackRresults: no visible global function definition for 'lines'
plot.crackRresults: no visible global function definition for 'abline'
tail.CD: no visible global function definition for 'tail'
tail.Mult: no visible global function definition for 'tail'
tail.Sing: no visible global function definition for 'tail'
tail.crackRparallel: no visible global function definition for 'tail'
tail.crackRresults: no visible global function definition for 'tail'
tail.parametersCD: no visible global function definition for 'tail'
tail.parametersMult: no visible global function definition for 'tail'
tail.parametersSing: no visible global function definition for 'tail'
tail.stateCD: no visible global function definition for 'tail'
tail.stateMult: no visible global function definition for 'tail'
tail.stateSing: no visible global function definition for 'tail'
Undefined global functions or variables:
  abline approx axis box head legend lines mtext par plnorm plot
  quantile runif tail
Consider adding
  importFrom("graphics", "abline", "axis", "box", "legend", "lines",
             "mtext", "par", "plot")
  importFrom("stats", "approx", "plnorm", "quantile", "runif")
  importFrom("utils", "head", "tail")
to your NAMESPACE file.