Names of R's available packages

Question

I\'m eager to know,

• how many package names on CRAN have two, three, N characters?
• which combinations have not yet been used (\"unpoppler\")
• h

Answer 1

here's one shot based on various suggestions.

 packages <- available.packages()[,'Package']

 ggplot(data.frame(n = nchar(packages))) +
   geom_histogram(aes(n), binwidth=1)     

 all <- length(packages)
 ## 3168
 up <- sum(toupper(packages) == packages)
 ## 262
 low <- sum(tolower(packages) == packages)
 ## 1697
 pie(c(up, low, all-up-low), labels=c("UPPERCASE","lowercase","cAmElCaSe"))

 let <- sapply(sapply(letters, grep, tolower(packages)), length)
 barplot(let)

 length(packages[grep("2$", packages, perl=TRUE)])
 # 29