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QR function

From: John W. Eaton
Subject: QR function
Date: Mon, 14 Jul 1997 10:17:04 -0500

On 14-Jul-1997, Moritz Harteneck <address@hidden> wrote:

| I am trying to make a QR decomposition of a fairly large matrix 
| (ca. 1584x252 real elements). However, I am not interested in the 
| rotation matrix q and I want to avoid it due to memory reasons. Does 
| anybody know how to do this?

With Octave 2.0.9, you can get R by running qr(x) and asking for only
one output:

  octave:1> help qr
  qr is a builtin function


  qr (X) alone returns the output of the LAPACK routine dgeqrf, such
  that R = triu (qr (X))


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