Re: [Rd] Internal codes of the factor

2006-03-14 Thread Berwin A Turlach 
G'day Gregor,

 GG == Gregor Gorjanc [EMAIL PROTECTED] writes:

GG I am writing some functions and I repeatedly acces internal
GG factor codes. I figured out that internal codes are 1:n where
GG 1 represents 1st level, 2 2nd level etc. This is not
GG documented [...]
The help page for factor states in the 'Details' section:

 The encoding of the vector happens as follows. First all the
 values in 'exclude' are removed from 'levels'. If 'x[i]' equals
 'levels[j]', then the 'i'-th element of the result is 'j'.  If no
 match is found for 'x[i]' in 'levels', then the 'i'-th element of
 the result is set to 'NA'.

Note in particular the part on then the 'i'-th element of the result
is 'j'.  This pretty much documents that the internal codes are 1:n
and 'NA', as documented in the following sentence.



Cheers,

Berwin

== Full address 
Berwin A Turlach  Tel.: +61 (8) 6488 3338 (secr)   
School of Mathematics and Statistics+61 (8) 6488 3383 (self)  
The University of Western Australia   FAX : +61 (8) 6488 1028
35 Stirling Highway   
Crawley WA 6009e-mail: [EMAIL PROTECTED]
Australiahttp://www.maths.uwa.edu.au/~berwin

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Re: [Rd] Internal codes of the factor

2006-03-14 Thread Gregor Gorjanc 
Berwin A Turlach wrote:
 G'day Gregor,
 
 
GG == Gregor Gorjanc [EMAIL PROTECTED] writes:
 
 
 GG I am writing some functions and I repeatedly acces internal
 GG factor codes. I figured out that internal codes are 1:n where
 GG 1 represents 1st level, 2 2nd level etc. This is not
 GG documented [...]
 The help page for factor states in the 'Details' section:
 
  The encoding of the vector happens as follows. First all the
  values in 'exclude' are removed from 'levels'. If 'x[i]' equals
  'levels[j]', then the 'i'-th element of the result is 'j'.  If no
  match is found for 'x[i]' in 'levels', then the 'i'-th element of
  the result is set to 'NA'.
 
 Note in particular the part on then the 'i'-th element of the result
 is 'j'.  This pretty much documents that the internal codes are 1:n
 and 'NA', as documented in the following sentence.

Thanks for this pointer to documentation.

-- 
Lep pozdrav / With regards,
Gregor Gorjanc

--
University of Ljubljana PhD student
Biotechnical Faculty
Zootechnical Department URI: http://www.bfro.uni-lj.si/MR/ggorjan
Groblje 3   mail: gregor.gorjanc at bfro.uni-lj.si

SI-1230 Domzale tel: +386 (0)1 72 17 861
Slovenia, Europefax: +386 (0)1 72 17 888

--
One must learn by doing the thing; for though you think you know it,
 you have no certainty until you try. Sophocles ~ 450 B.C.

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