[R] function help?

[Duke]

  On 9/16/10 5:00 PM, Rolf Turner wrote:
> On 17/09/2010, at 8:51 AM, Duke wrote:
>
>>   Hi Duncan,
>>
>> On 9/16/10 3:47 PM, Duncan Murdoch wrote:
>>> On 16/09/2010 3:40 PM, Duke wrote:
>>>>    Hi all,
>>>>
>>>> I am writing a function (fun.R), but I dont know how to code the
>>>> function so that the Help Text will be shown up when one types ?fun (of
>>>> course, after he loads it up). Anyone has any advice for me how to do
>>>> that?
>>>>
>>>>
>>> The help text is separate from the function (unless you use the
>>> roxygen package or similar).  You need to write a package so that R
>>> will find the help; instructions are in the Writing R Extensions manual.
>> I was expecting something simpler than writing a package, and that I can
>> integrate it into fun.R, but thanks anyway.
> (a) Writing a package is not all that hard.

You can say so if you are fluent in R. I just started and have written 
only 20-30 lines of codes so far. Also, writing a package is still more 
complicated than writing a simple function (single file). Why R is so 
different from other languages (python, matlab or more basics like C/C++ 
etc...)? In fact I still feel very uncomfortable with R, for example, I 
hate when I type a function name, it shows the whole function.

Honestly I feel a world of programming is a mess, and it is tough when 
one wants to jump from one language to another.

> (b) It focuses the mind wondrously.

I did try to write a simple package (followed a tutorial), but did not 
find what you said :). Maybe I need more practice.

> (c) Using R CMD check on the package is very useful for picking the
> lint off the code.
>

It would be great if you share your experience a little more about this.

Thanks,

D.

> 	cheers,
>
> 		Rolf Turner
>
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