[R] Two questions about the creating new package

[Song Baiyi]

Hello everyone,

I am just trying to colloct all my function into a new packages. I met 
two questions which hurt me so much:

1. when I use the "prompt" to help to write Rd file for a variable x 
which is character vector, say x <- c("a","b"), it always give the error 
informaion:
Error in get(x, envir, mode, inherits) : variable "a" was not found.
Obvious it regards the "a" as the variable name instead of the item of a 
vector. So how can I put a character vector into the pacakge, or it must 
be a data.frame to put into a package?

2. Also about the constant character vector. I have a constant vector 
which record the column names. I hope when the package is loaded, this 
vector will be loaded without explict writing "data(***)". Therefore the 
users and other functions can use it. How can I do it? A more generate 
question is where should I put those R codes which will be excuted after 
the package is loaded?

Thank you very much!

Baiyi Song
Computer engineering institute
Dortmund University