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xiaoping Jin

2002-Aug-22 05:13 UTC

[R] LAPACK in R

<html><div
style=''background-color:''><DIV></DIV>
<DIV></DIV>
<P><BR>Hi, </P>
<P>Now I am writting a R program, which&nbsp;calls a C program by
using .C&nbsp;function. I&nbsp;like to use some matrix calculation
functions provided by R package in&nbsp;my C program, for example, Cholesky
decomposition.</P>
<P>When I read&nbsp;"write R extension",&nbsp;it saild
"the header file R_ext/linpack.h contains BLAS, LINPACK functions included
in R.&nbsp;But we know LAPACK is better than&nbsp;Linpack.&nbsp;Is
it possible to use functions from LAPACK.&nbsp;&nbsp;I also
saw&nbsp;R_ext/lapack.h in&nbsp;src/r_ext&nbsp; directory. How to
use this header file?</P>
<P>I&nbsp;have checked "matrix" package. There it used
functions from lapack c++ . How to use those information in my C program? What I
should do?<BR></P>
<P>Hope you can help me out! </P>
<P>&nbsp;</P>
<P>Thanks,</P>
<P><BR>Xiaoping </P>
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ripley@stats.ox.ac.uk

2002-Aug-22 19:10 UTC

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[R] LAPACK in R

You can't do this.  Some of LAPACK is included in the lapack module, but
that is not a part of R that is always loaded, and the code has been
corrected.

Similarly you cannot easily use compiled code in another package.

What's so hard about linking your own code against your system's lapack
library?

On Wed, 21 Aug 2002, xiaoping Jin wrote:
>
>
> Hi,
>
> Now I am writting a R program, which calls a C program by using
> .C function. I like to use some matrix calculation functions provided by
> R package in my C program, for example, Cholesky decomposition.
>
> When I read "write R extension", it saild "the header file
> R_ext/linpack.h contains BLAS, LINPACK functions included in R. But we
> know LAPACK is better than Linpack. Is it possible to use functions from
> LAPACK.  I also saw R_ext/lapack.h in src/r_ext  directory. How to use
> this header file?
>
> I have checked "matrix" package. There it used functions from
lapack c++
> . How to use those information in my C program? What I should do?
>
> Hope you can help me out!
>
>
>
> Thanks,
>
>
> Xiaoping
>
>
>
>
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> r-help mailing list -- Read
> http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info",
"help", or
> "[un]subscribe" (in the "body", not the subject !) To:
> r-help-request at stat.math.ethz.ch
>
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>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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