[R] .fortran code

[Ravi Varadhan]

I am attaching the Fortran .f files rs.f & rg.f, if that would help.  You
can also get these routines (and more, such as the routines called by rg.f
and rs.f) from "netlib" - http://www.netlib.org/eispack/index.html   

The reason that you can find these from google search is that they are part
of EISPACK which is a well-known linear algebra package, whereas wilder.f is
a fortran routine written specifically for a particular package.  You should
contact the author of that package for the source code.  

For the source codes in "mypkg", look in the directory (in Windows, for
example): 
C:\Program Files\R\R-2.6.1/src/library/mypkg/src

For building R from source check the R-FAQ.

Hope this helps,
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: Shubha Vishwanath Karanth [mailto:shubhak at ambaresearch.com] 
Sent: Friday, February 08, 2008 1:05 AM
To: Ravi Varadhan; r-help at stat.math.ethz.ch
Subject: RE: [R] .fortran code

Hi Ravi,

...In the same fashion, I was trying to look at wilder.f of 'wilderSum'
command of the TTR package. I even googled for the keyword, "wilder.f
wilderSum" or " subroutine wilder", but did not find anything useful.

Also I did not get when you said  " So,you can look at these files if you
had installed the source code". Where to look at these files(without going
to google)...is there anything which I need to install more?


BR, Shubha
Shubha Karanth | Amba Research
Ph +91 80 3980 8031 | Mob +91 94 4886 4510 
Bangalore * Colombo * London * New York * San José * Singapore *
www.ambaresearch.com

-----Original Message-----
From: Ravi Varadhan [mailto:rvaradhan at jhmi.edu] 
Sent: Thursday, February 07, 2008 8:56 PM
To: Shubha Vishwanath Karanth; r-help at stat.math.ethz.ch
Subject: RE: [R] .fortran code

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



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