'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
File ‘htdp/libs/htdp.so’:
  Found no calls to: ‘R_registerRoutines’, ‘R_useDynamicSymbols’

It is good practice to register native routines and to disable symbol
search.

See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory

Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘RColorBrewer’ ‘ggplot2’ ‘knitr’ ‘markdown’
  All declared Imports should be used.

'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
Namespaces in Imports field not imported from:
  ‘dplyr’ ‘stats’
  All declared Imports should be used.
'LazyData' is specified without a 'data' directory
Namespaces in Imports field not imported from:
  ‘dplyr’ ‘stats’
  All declared Imports should be used.
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory
Namespaces in Imports field not imported from:
  ‘dplyr’ ‘stats’
  All declared Imports should be used.
'LazyData' is specified without a 'data' directory
Namespaces in Imports field not imported from:
  ‘dplyr’ ‘stats’
  All declared Imports should be used.
'LazyData' is specified without a 'data' directory
'LazyData' is specified without a 'data' directory