R : Copyright 2005, The R Foundation for Statistical Computing
Version 2.1.1  (2005-06-20), ISBN 3-900051-07-0

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> ### * <HEADER>
> ###
> attach(NULL, name = "CheckExEnv")
> assign(".CheckExEnv", as.environment(2), pos = length(search())) # base
> ## add some hooks to label plot pages for base and grid graphics
> setHook("plot.new", ".newplot.hook")
> setHook("persp", ".newplot.hook")
> setHook("grid.newpage", ".gridplot.hook")
> 
> assign("cleanEx",
+        function(env = .GlobalEnv) {
+ 	   rm(list = ls(envir = env, all.names = TRUE), envir = env)
+            RNGkind("default", "default")
+ 	   set.seed(1)
+    	   options(warn = 1)
+ 	   delayedAssign("T", stop("T used instead of TRUE"),
+ 		  assign.env = .CheckExEnv)
+ 	   delayedAssign("F", stop("F used instead of FALSE"),
+ 		  assign.env = .CheckExEnv)
+ 	   sch <- search()
+ 	   newitems <- sch[! sch %in% .oldSearch]
+ 	   for(item in rev(newitems))
+                eval(substitute(detach(item), list(item=item)))
+ 	   missitems <- .oldSearch[! .oldSearch %in% sch]
+ 	   if(length(missitems))
+ 	       warning("items ", paste(missitems, collapse=", "),
+ 		       " have been removed from the search path")
+        },
+        env = .CheckExEnv)
> assign("..nameEx", "__{must remake R-ex/*.R}__", env = .CheckExEnv) # for now
> assign("ptime", proc.time(), env = .CheckExEnv)
> grDevices::postscript("urn-Examples.ps")
> assign("par.postscript", graphics::par(no.readonly = TRUE), env = .CheckExEnv)
> options(contrasts = c(unordered = "contr.treatment", ordered = "contr.poly"))
> options(warn = 1)    
> library('urn')
> 
> assign(".oldSearch", search(), env = .CheckExEnv)
> assign(".oldNS", loadedNamespaces(), env = .CheckExEnv)
> cleanEx(); ..nameEx <- "urn"
> 
> ### * urn
> 
> flush(stderr()); flush(stdout())
> 
> ### Name: urn
> ### Title: Repeated Sampling Without Replacement
> ### Aliases: urn sampleu refill.urn
> ### Keywords: datagen distribution
> 
> ### ** Examples
> 
> 
> library(urn)
> 
> # Create urn with 3 items
> u<-urn(list(1,2,3))
> 
> # custom print and summary methods
> print(u )
List type: 
current:  1, 2, 3 
initial:  1, 2, 3 
> summary(u)

1 2 3 
1 1 1 
> 
> # draw 2 samples from the urn
> sampleu(u,2)
[[1]]
[1] 1

[[2]]
[1] 3

> # can't sample more items than in the urn, without refilling:
> # sampleu(u,2)
> sum(u)
[1] 1
> sampleu(u,1)
[[1]]
[1] 2

> # refill
> refill.urn(u)  
[1] 3
> # Create an urn with 100010 items of two types in ~51:49 proportions
> ub<-urn(c(51006,49004))
> summary(ub)
    A     B 
51006 49004 
> 
> # take ten draws each of 10001 items
> rep<-replicate(10, table(sampleu(ub,10001)), simplify=TRUE)
> print(rep)
  [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
1 5144 5095 5163 5072 4999 5091 5091 5108 5162  5081
2 4857 4906 4838 4929 5002 4910 4910 4893 4839  4920
> 
> # should equal 51006
> sum(rep[1,])
[1] 51006
> 
> 
> 
> 
> ### * <FOOTER>
> ###
> cat("Time elapsed: ", proc.time() - get("ptime", env = .CheckExEnv),"\n")
Time elapsed:  4.03 0.06 4.09 0 0 
> grDevices::dev.off()
null device 
          1 
> ###
> ### Local variables: ***
> ### mode: outline-minor ***
> ### outline-regexp: "\\(> \\)?### [*]+" ***
> ### End: ***
> quit('no')