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> ################################################################################
> ##
> ## $Id: sample.matrix.test.R 346 2006-10-01 05:08:55Z enos $
> ##
> ## Tests that .sample.matrix correctly samples from a matrix of probabilities
> ##
> ################################################################################
> 
> library(portfolio)
Loading required package: grid
Loading required package: lattice
> 
> ## tests that the match.matrix matches the values with the highest
> ## probabilities
> 
> ## sets all the values of i to a low probability
> 
> probs <- matrix(0, nrow = 5,
+             ncol = 10,
+             dimnames = list(1:5, letters[1:10])
+             )
> 
> ## sets letter "a" to have a high probability of being chosen
> 
> probs[,1] <- 0.9999
> 
> set.seed(1)
> test <- portfolio:::.sample.matrix(probs, 100)
> 
> truth <- matrix("a", nrow = 5,
+             ncol = 100,
+             dimnames = list(1:5, 1:100)
+             )
> 
> stopifnot(
+           all.equal(test, truth)
+           )
> 
> 
> proc.time()
   user  system elapsed 
   0.43    0.14    0.51