[R] Rank of a matrix?

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Fri Jun 7 09:45:51 CEST 2002

Manuel Castejón Limas <manuel.castejon at dim.unirioja.es> writes:

> Hello everyone,
> this is a very simple question but I could  not find the answer. :-(
> Is there any function in R for calculating the rank of a matrix?
> (In the sense of the dimension of the vectorial space that spans)

It's a byproduct of chol() and qr(), but beware that it is numerically
ill-defined due to round-off. Notice the tol= argument to qr().

   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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