If you look at the source code for eigen() you will notice that the .Fortran
calls a subroutine named either "rs.f" or "rg.f" depending
on whether your
matrix is real and symmetric or real and asymmetric, respectively. So, you
can look at these files if you had installed the source code. Even if you
had not installed the full source, you can google using keywrods "rs.f
eigenvalue" or "rg.f eigenvalue" to see the Fortran code for
these functions
available from EISPACK. However, I am not sure how illuminating that would
be since rs.f and rg.f are just calling routines that each calls a number of
other subroutines. So, unless you are willing to spend a great deal of
time, you may not be any wiser at the end of all this.
Ravi.
----------------------------------------------------------------------------
-------
Ravi Varadhan, Ph.D.
Assistant Professor, The Center on Aging and Health
Division of Geriatric Medicine and Gerontology
Johns Hopkins University
Ph: (410) 502-2619
Fax: (410) 614-9625
Email: rvaradhan at jhmi.edu
Webpage: http://www.jhsph.edu/agingandhealth/People/Faculty/Varadhan.html
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--------
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On
Behalf Of Shubha Vishwanath Karanth
Sent: Thursday, February 07, 2008 9:42 AM
To: r-help at stat.math.ethz.ch
Subject: [R] .fortran code
Hi,
I need to look/understand what the ".fortran()" doing in say, the
source
code of the "eigen" command. How do I look into this?
Thanks,
Shubha
This e-mail may contain confidential and/or privileged i...{{dropped:13}}
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