I think all these points are answered in the README.packages for R 2.5.0
alpha (and probably for 2.4.1 too).
You can use pexports to create Rlapack.exp, for example.
On Fri, 30 Mar 2007, [EMAIL PROTECTED] wrote:
Many thanks to Brian for his very useful information and help. A quick
look at mgcv package already gives me some directions to try. I remember
that I tried to use Rlapack.dll instead of R.dll without success,
perhaps because I don't know how to build an import library for
Rlapack.dll and link against it (README.packages shows how to do this
for R.dll using R.exp, but I could not find Rlapack.exp). I will try to
see if I can figure out this part using VC++6.0.
Yes, I am still using R-2.2.1. I did try to upgrade it to R-2.4.1.
However, the newer versions cause some troubles for my C programs. They
produce error messages when my DLL are loaded into R. The problem
relates to function calls such as isfinite. I haven't figured out why my
C programs have this problem with newer versions of R but not with
version 2.2.1. I remember there was a post on this issue in this list,
but I did not see any solution. I hope to find a clue about it too so
that I can keep the pace of R development.
Paul.
----- Original Message -----
From: Prof Brian Ripley <[EMAIL PROTECTED]>
Date: Friday, March 30, 2007 1:56 am
Subject: Re: [R] Using functions in LAPACK in a C program
To: Paul August <[EMAIL PROTECTED]>
Cc: r-help@stat.math.ethz.ch
On Thu, 29 Mar 2007, Paul August wrote:
Hi,
I wonder where I can find an example of using a function in
LAPACK
library in a user's own C code.
In about 20 R packages, e.g. the recommended package mgcv.
I wrote a C program which will be
compiled and linked to produce a DLL file and then loaded into
R. I hope
to use a function from LAPACK library, for example, dgesdd, in
the
program. Following R manual, I call the function by
F77_CALL(dgesdd) in
the program. The program can be compiled without problems.
However, when
it is linked to produce a DLL file, I get an error message
Test.obj : error LNK2001: unresolved external symbol _dgesdd_
Test.dll : fatal error LNK1120: 1 unresolved externals
I use VC++6.0 and the command of linking is something like this
link.exe Rdll.lib /nologo /dll /out:Test.dll
/libpath:C:\R\R-2.2.1\src\gnuwin32 Test.obj
Apparently, the linker cannot resolve dgesdd from Rdll.lib. If
anyone
knows what I missed here or any example that shows how this
can be done
properly, please let me know. Thanks a lot.
It is in Rlapack.dll not R.dll.
The linking information is in 'Writing R Extensions' for those
using the
recommended compilation system (search for LAPACK_LIBS).
You will need to build an import library for Rlapack.dll and
link against
that.
And BTW you seem to be using R 2.2.1: please update as we can
only offer
accurate advice on recent systems.
--
Brian D.
Ripley, [EMAIL PROTECTED]
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 272866 (PA)
Oxford OX1 3TG,
UK Fax: +44 1865 272595
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-
project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
-----------------------------------------------
Dr. Paul Y. Peng
Associate Professor of Biostatistics
Department of Community Health and Epidemiology
and Department of Mathematics and Statistics
Queen's University, Kingston, ON, K7L 3N6
Phone: 613-533-6000 Ext 78525
Email: [EMAIL PROTECTED]
Fax: 613-533-6794
-----------------------------------------------
[[alternative HTML version deleted]]
--
Brian D. Ripley, [EMAIL PROTECTED]
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 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
