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}.