Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘vignette.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘vignette.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘vignette.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘vignette.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Package vignette with \VignetteEngine{} not specifying an engine package:
  'vignette.Rmd'
Engines should be specified as \VignetteEngine{PKG::ENG}.

Found export directive that requires package ‘methods’:
  ‘exportClasses’
Remove all such namespace directives (if obsolete) or ensure that the
DESCRIPTION Depends or Imports field contains ‘methods’.
Found export directive that requires package ‘methods’:
  ‘exportClasses’
Remove all such namespace directives (if obsolete) or ensure that the
DESCRIPTION Depends or Imports field contains ‘methods’.
Found export directive that requires package ‘methods’:
  ‘exportClasses’
Remove all such namespace directives (if obsolete) or ensure that the
DESCRIPTION Depends or Imports field contains ‘methods’.
Found export directive that requires package ‘methods’:
  ‘exportClasses’
Remove all such namespace directives (if obsolete) or ensure that the
DESCRIPTION Depends or Imports field contains ‘methods’.
Found export directive that requires package 'methods':
  'exportClasses'
Remove all such namespace directives (if obsolete) or ensure that the
DESCRIPTION Depends or Imports field contains 'methods'.

Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘pacviz.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘pacviz.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Namespace in Imports field not imported from: ‘e1071’
  All declared Imports should be used.
Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘pacviz.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Namespace in Imports field not imported from: ‘e1071’
  All declared Imports should be used.
Package vignette with \VignetteEngine{} not specifying an engine package:
  ‘pacviz.Rmd’
Engines should be specified as \VignetteEngine{PKG::ENG}.
Package vignette with \VignetteEngine{} not specifying an engine package:
  'pacviz.Rmd'
Engines should be specified as \VignetteEngine{PKG::ENG}.