[R] function for rank of a matrix ?

[Peter Dalgaard BSA]

Raphael Gottardo <raph at alvie-mail.lanl.gov> writes:

> Hello R'users,
> 
> I have a quick question. I wanted to know if there exist a function in R
> to compute the rank of a matrix. I could not find anything about it.

Your best bet is probably qr(X)$rank, but beware that determining the
rank numerically is an ill-defined operation due to floating-point
imprecisions. In particular, notice that qr has a tol= argument. 

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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