Running examples in 'TaoTeProgramming-Ex.R' failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: P.backcolor
> ### Title: Tao Te Programming illustrations
> ### Aliases: P.backcolor P.bend01 P.bend03 P.bend04 P.bend05
> ###   P.butterflies01 P.butterflies02 P.chess P.chess02 P.chess03
> ###   P.frontcolor P.hillscene01 P.mountscene01 P.mountscene02
> ###   P.mountscene03 P.mountscene04 P.polyhull01 P.polysort01 P.polytile01
> ###   P.polytile02 P.polytile03 P.polytile04 P.polytile05 P.quadtile01
> ###   P.quadtile02 P.quadtile03 P.quadtile04 P.roads01 P.roads02 P.sticks01
> ###   P.sticks02 P.sticks03 P.sticks04 P.template P.tree01 P.tree02
> ###   P.tree03 P.tritile01 P.tritile02 P.tritile03 P.wave01 P.wave02
> ###   P.wavescene01 P.wavescene02 P.wavescene03
> ### Keywords: hplot
> 
> ### ** Examples
> 
> P.backcolor(NULL)
> 
> # see all the specific plot functions
> ls("package:TaoTeProgramming", pattern='^P')
 [1] "P.backcolor"     "P.bend01"        "P.bend03"        "P.bend04"       
 [5] "P.bend05"        "P.butterflies01" "P.butterflies02" "P.chess"        
 [9] "P.chess02"       "P.chess03"       "P.frontcolor"    "P.hillscene01"  
[13] "P.mountscene01"  "P.mountscene02"  "P.mountscene03"  "P.mountscene04" 
[17] "P.polyhull01"    "P.polysort01"    "P.polytile01"    "P.polytile02"   
[21] "P.polytile03"    "P.polytile04"    "P.polytile05"    "P.quadtile01"   
[25] "P.quadtile02"    "P.quadtile03"    "P.quadtile04"    "P.roads01"      
[29] "P.roads02"       "P.sticks01"      "P.sticks02"      "P.sticks03"     
[33] "P.sticks04"      "P.template"      "P.tree01"        "P.tree02"       
[37] "P.tree03"        "P.tritile01"     "P.tritile02"     "P.tritile03"    
[41] "P.wave01"        "P.wave02"        "P.wavescene01"   "P.wavescene02"  
[45] "P.wavescene03"  
> 
> # view a random plot
> get(sample(ls("package:TaoTeProgramming", pattern='^P')))(NULL)
Error in get(sample(ls("package:TaoTeProgramming", pattern = "^P"))) : 
  first argument has length > 1
Execution halted