R help - Mar 2010 - Printing the function t.test() in R

Dear R Users,

I have a question, how does one print an r function like t.test in R (to get
the whole function and not just a summary of the environment)?   For example
if I type the following:
> t.test
function (x, ...)
UseMethod("t.test")
<environment: namespace:stats>
> print(t.test)
function (x, ...)
UseMethod("t.test")
<environment: namespace:stats>

I don't get the entire function printed.

Kind regards,


-- 
Luwis Diya,
Leuven Biostatistics and Statistical Bioinformatics Centre (L-BioStat),
Kapucijnenvoer 35 blok d - bus 7001,
3000 Leuven,
Belgium

Tel: +32 16 336886 or +32 16 336892
Fax: +32 16 337015

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Hi Luwis,
this task is solved in the R Help Desk, see R News 6/4 
http://cran.r-project.org/doc/Rnews/Rnews_2006-4.pdf

in short "t.test" is a S3-method and you can have a look at
implemented
methods with

methods(t.test)

and then use e.g.

getAnywhere(t.test.default)

hth.

Luwis Tapiwa Diya schrieb:
> Dear R Users,
>
> I have a question, how does one print an r function like t.test in R (to
get
> the whole function and not just a summary of the environment)?   For
example
> if I type the following:
>
>   
>> t.test
>>     
> function (x, ...)
> UseMethod("t.test")
> <environment: namespace:stats>
>   
>> print(t.test)
>>     
> function (x, ...)
> UseMethod("t.test")
> <environment: namespace:stats>
>
> I don't get the entire function printed.
>
> Kind regards,
>
>
>   
-- 
Eik Vettorazzi
Institut f?r Medizinische Biometrie und Epidemiologie
Universit?tsklinikum Hamburg-Eppendorf

Martinistr. 52
20246 Hamburg

T ++49/40/7410-58243
F ++49/40/7410-57790



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Prof. Dr. Dr. Uwe Koch-Gromus

On Mar 31, 2010, at 8:35 AM, Luwis Tapiwa Diya wrote:
> Dear R Users,
>
> I have a question, how does one print an r function like t.test in R  
> (to get
> the whole function and not just a summary of the environment)?   For  
> example
> if I type the following:
>
>> t.test
> function (x, ...)
> UseMethod("t.test")
> <environment: namespace:stats>
>> print(t.test)
> function (x, ...)
> UseMethod("t.test")
> <environment: namespace:stats>
>
> I don't get the entire function printed.
 > methods(t.test)
[1] t.test.default* t.test.formula*

    Non-visible functions are asterisked
# Noting the asterisk, one need to use getAnywhere()

 > getAnywhere(t.test.default)
A single object matching ?t.test.default? was found
It was found in the following places
   registered S3 method for t.test from namespace stats
   namespace:stats
with value

function (x, y = NULL, alternative = c("two.sided", "less",
"greater"),
     mu = 0, paired = FALSE, var.equal = FALSE, conf.level = 0.95,
     ...)
### snipped the code -----------------

There was an R-News a couple of years back by (if memory serves)  
Ligges describing various methods for getting at source. Yes, there it  
is:
Ligges, U. (2006): R Help Desk: Accessing the Sources. R News 6 (4),   
43-45. http://cran.r-project.org/doc/Rnews/Rnews_2006-4.pdf

-- 

David Winsemius, MD
West Hartford, CT