[Rcpp-devel] Convert R matrix to boost ublas?

[Dale Smith]

Before you undertake any work on ublas, I would read the FAQ carefully. There have been no significant commits since 2009.

http://www.boost.org/doc/libs/1_58_0/libs/numeric/ublas/doc/index.html

“Performance? There are faster alternatives. Cutting edge? uBLAS is more than 10 years old and missed all new stuff from C++11.”


Dale Smith, Ph.D.
Data Scientist
​
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From: rcpp-devel-bounces at lists.r-forge.r-project.org [mailto:rcpp-devel-bounces at lists.r-forge.r-project.org] On Behalf Of Charles Determan
Sent: Wednesday, May 27, 2015 8:10 AM
To: Dirk Eddelbuettel
Cc: rcpp-devel at lists.r-forge.r-project.org
Subject: Re: [Rcpp-devel] Convert R matrix to boost ublas?

This was more of a curiosity question.  Armadillo and Eigen are great and I will likely use them for most of my purposes.  I have just been exploring more of the boost library and was wondering about it.  That said, it would be a potentially useful exercise for me when I have some more time to devote to it.  You mention starting with the as<>() and wrap() converters.  Is there any documentation on developing additional Rcpp functions or should I just go in to the source and try to find my way around?
Regards,
Charles

On Tue, May 26, 2015 at 4:00 PM, Dirk Eddelbuettel <edd at debian.org<mailto:edd at debian.org>> wrote:

On 26 May 2015 at 15:32, Charles Determan wrote:
| I have seen in the archives a discussion of converting a boost ublas matrix to
| Rcpp (http://lists.r-forge.r-project.org/pipermail/rcpp-devel/2011-June/
| 002402.html) but I didn't see anything about passing an R matrix in to a ublas
| object.  There doesn't appear to be an 'as' method for it (unless I have
| somehow overlooked it).  Any recommendations on efficiently getting an R matrix
| in to a boost ublas matrix?
Correct, as far as Rcpp is concerned uBlas is 'a new external entity' so you
would have to start with as<>() and wrap() converters.

Almost everybody I talked to about ublas "is aware" of it, yet nobody seems
to like it all that much.   Any reason Armadillo or Eigen won't do for you?

Dirk

--
http://dirk.eddelbuettel.com | @eddelbuettel | edd at debian.org<mailto:edd at debian.org>

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