[Rd] Fortran routines from LINPACK in S+ but not R

Prof Brian Ripley ripley@stats.ox.ac.uk
Thu, 23 Aug 2001 13:27:22 +0100 (BST)

On Thu, 23 Aug 2001 fharrell@virginia.edu wrote:

> Dear R Developers,
> I should have had the Design library running in R by now but
> have kept putting off changing some calls to LINPACK routines
> to use those builtin to R.  Specifically I call dqrsl1 and dqr.
> Would it be an easy task to put those in the next release of
> R?  If not I'll finally bite the bullet and get back into
> reading LINPACK documentation (which I have but haven't
> examined in depth).
> If dqrsl1 and dqr are not truly parts of LINPACK but are
> front-ends to routines that are, and if anyone has
> those front-ends to share, that would also solve my problem
> immediately.

I am pretty sure that they are not part of LINPACK: certainly dqr is not
and neither has a LINPACK name.  dqr is called by qr.default in S-PLUS,
and you should find dqrdc2 (also not LINPACK) called by R's qr an adequate

As for dqrsl1, I've never known exactly what it supposed to do.
Would dqrsl (which is there) suffice?

Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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