[R] writing a R package

[Yi-Xiong Zhou]

Dear Sir/Madam, 

I am trying to write a R package and I found what has been said in the
"Writing R Extensions" is mostly different from what has been done in the
existing packages. For example, in MASS package, there is no *.Rd files nor
*.rd files. There is an R-ex directory, which has all the .R files, which
should be in the R directory according to the manual. Supprisingly, in the R
directory, there is a text file without file extension of .R, which has all
the R functions. 

Could you help me to solve this puzzle? I am lost. 

Thanks. 

Yi-Xiong

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