[R] Reading biplot function's source code

[Gavin Simpson]

Hector Villalobos Ortiz wrote:
> Hi everybody,
> 
> Excuse me for this silly question, but after searching the help archives 
> I'm still unable to find my way to read the source code of the "biplot" 
> function in R.
> 
> I have installed the mvbutils package, and tried:
> 
>> fixr(biplot)
> 
> 
> which only gives me:
> 
> function (x, ...)
> UseMethod("biplot")
> 
> with no further details....
> 
> I'd like to read the code to see if it is possible to display arrows 
> only for some "significant" variables to avoid cluttering. Thank you in 
> advance.
> 

That is the code for biplot()! biplot() is a generic function, and 
biplot methods can be written to draw biplots of results produced by 
different functions.

 > methods(biplot)
[1] biplot.default*  biplot.prcomp*   biplot.princomp*

Shows us that currently there are 3 methods for biplot in my 
environment. The * indicates that the code for those methods are not 
visible to users directly.

getAnywhere(biplot.prcomp) is one way of viewing the code.

HTH

Gav

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Gavin Simpson                     [T] +44 (0)20 7679 5522
ENSIS Research Fellow             [F] +44 (0)20 7679 7565
ENSIS Ltd. & ECRC                 [E] gavin.simpsonATNOSPAMucl.ac.uk
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