Namespace in Imports field not imported from: ‘grDevices’
  All declared Imports should be used.
Namespace in Imports field not imported from: ‘grDevices’
  All declared Imports should be used.
Running examples in 'gsignal-Ex.R' failed
The error most likely occurred in:

> ### Name: aryule
> ### Title: Autoregressive model coefficients - Yule-Walker method
> ### Aliases: aryule
> 
> ### ** Examples
> 
> a <- Arma(1, c(1, -2.7607, 3.8106, -2.6535, 0.9238))
> y <- filter(a, rnorm(1024))
> coefs <- aryule(y, 4)
Error in if (all(Im(z <- zapsmall(x, 12)) == 0)) Re(z) else x : 
  missing value where TRUE/FALSE needed
Calls: aryule -> xcorr -> ifft -> zapIm
Execution halted
Namespace in Imports field not imported from: 'grDevices'
  All declared Imports should be used.
Namespace in Imports field not imported from: ‘grDevices’
  All declared Imports should be used.
Error(s) in re-building vignettes:
  ...
--- re-building ‘gsignal.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 184-212 (gsignal.Rmd) 
Error: processing vignette 'gsignal.Rmd' failed with diagnostics:
'x' and 'y' lengths differ
--- failed re-building ‘gsignal.Rmd’

SUMMARY: processing the following file failed:
  ‘gsignal.Rmd’

Error: Vignette re-building failed.
Execution halted
Namespace in Imports field not imported from: ‘grDevices’
  All declared Imports should be used.
Namespace in Imports field not imported from: ‘grDevices’
  All declared Imports should be used.