[Rcpp-devel] RcppArmadillo error

Dirk Eddelbuettel edd at debian.org
Fri Mar 26 17:20:22 CET 2010


On 26 March 2010 at 15:32, Abhisek wrote:
| Hi Dirk,
| 
| Just so that I understand.  I copied the code in the RcppArmadillo section
| on your website and pasted and saved it.  

What code? What page? 

| Are you saying I should change
| #include <RcppArmadillo> to #include <Rcpp> and #include <armadillo> ?

No that is not what I said.  I said 

    You can't just look at FastLM() and think your code will run like it.
    RcppArmadillo __does not export its classes__.  It is an implementation
    reference -- it gives you guidance as to how to implement C++ packages of
    your own against other libraries.

    If you "just" want to use Armadillo and have Rcpp help you, look at the
    installed example 'FastLM' in the Rcpp package.  In other words ignore
    RcppArmadillo for now.

So look at /usr/local/lib/Rcpp/examples/FastLM/ and the files there.  Run 

    fastLMviaArmadillo.r

and look at it. That should work.

You can also look at the _entire RcppArmadillo package_ and see how the
pieces fit together, including src/Makevars.

But don't just take semi-random shortcuts and expect that to work. If we
could make it any simpler, we would.  There is a reason RcppArmadilli is
package and not just a file.

Dirk
 
| best,
| abhisek
| 
| On Fri, Mar 26, 2010 at 1:40 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
| 
| >
| > Hi Abhisek,
| >
| > On 26 March 2010 at 12:28, Abhisek wrote:
| > | I downloaded the stuff just last friday so it should be the latest
| > version
| > | of Rcpp as well as Armadillo.  I used install.packages() for Rcpp and
| > | RcppArmadillo.  Armadillo is 0.9.4.  Im using xubuntu karmic koala.
| >
| > Ok, that is all good.  And if RcppArmadillo installed you have proper
| > libraries, Armadillo included.
| >
| > I think part of your problem is a misunderstanding of an issue we may not
| > have made particularly clear:  You can't just look at FastLM() and think
| > your code will run like it.  RcppArmadillo __does not export its classes__.
| > It is an implementation reference -- it gives you guidance as to how to
| > implement C++ packages of your own against other libraries.
| >
| > If you "just" want to use Armadillo and have Rcpp help you, look at the
| > installed example 'FastLM' in the Rcpp package.  In other words ignore
| > RcppArmadillo for now.
| >
| > The example (in 0.7.10) uses an idiom we no longer like and I am about to
| > change that for an upcoming 0.7.11 release, but it should works as is and
| > just use inline -- so no messing with makefile etc.
| >
| > Try that and see how it goes and keep us posted.
| >
| > Cheers, Dirk
| >
| >
| > | i also had some problem using Armadillo which I posted on the Armadillo
| > | discussion board.  Conrad got back to me.  Here is the discussion:
| > | https://sourceforge.net/apps/phpbb/arma/viewtopic.php?f=1&t=4
| > |
| > | so it may be that armadillo is the problem but im really not sure.
| > |
| > | Many thanks
| > | Abhisek
| > |
| > | On Fri, Mar 26, 2010 at 12:17 PM, Dirk Eddelbuettel <edd at debian.org>
| > wrote:
| > |
| > | >
| > | > (resending, this time to list I omitted last time, sorry. --Dirk)
| > | >
| > | > On 26 March 2010 at 11:10, Abhisek wrote:
| > | > | Hi,
| > | > |
| > | > | Ive been trying to make RcppArmadillo work using the example file
| > | > (fastLM).
| > | > | I copied and pasted the code and saved it as RcppArmadilloEg.cpp (not
| > to
| > | > use
| > | > | fastLM but to figure out how to work RcppArmadillo).  Then i tried
| > using
| > | > the
| > | > | command R CMD SHLIB RcppArmadilloEg.cpp but an error came up saying
| > that
| > | > | RcppArmadillo.h not found.
| > | > |
| > | > | So i tried doing a symbolic link from /usr/local/include to the
| > directory
| > | > | where RcppArmadillo.h and RcppArmadilloDefines.h is stored.  I also
| > did a
| > | > | symbolic link analogously for RcppArmadillo.so.  When i ran R CMD
| > SHLIB
| > | > | again I got the following error:
| > | > |
| > | > | abhisek at shieks:~/Desktop/Personal/Test$ R CMD SHLIB
| > RcppArmadilloEg.cpp
| > | > | g++ -I/usr/share/R/include
| > | > | -I/home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib -fpic  -g
| > -O2
| > | > -c
| > | > | RcppArmadilloEg.cpp -o RcppArmadilloEg.o
| > | >
| > | > So far so good:  one -I for R as usual, one for Rcpp.
| > | >
| > | > | In file included from
| > | > |
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/RcppCommon.h:215,
| > | > |                  from
| > | > | /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp.h:28,
| > | > |                  from RcppArmadilloEg.cpp:1:
| > | > |
| > | >
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp/internal/wrap.h:
| > | > | In function ‘SEXPREC*
| > | > Rcpp::internal::wrap_dispatch_unknown_iterable(const
| > | > | T&, Rcpp::traits::false_type) [with T = arma::Col<double>]’:
| > | > |
| > | >
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp/internal/wrap.h:491:
| > | > | instantiated from ‘SEXPREC*
| > Rcpp::internal::wrap_dispatch_unknown(const
| > | > T&,
| > | > | Rcpp::traits::false_type) [with T = arma::Col<double>]’
| > | > |
| > | >
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp/internal/wrap.h:509:
| > | > | instantiated from ‘SEXPREC*
| > | > | Rcpp::internal::wrap_dispatch_unknown_importable(const T&,
| > | > | Rcpp::traits::false_type) [with T = arma::Col<double>]’
| > | > |
| > | >
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp/internal/wrap.h:526:
| > | > | instantiated from ‘SEXPREC* Rcpp::internal::wrap_dispatch(const T&,
| > | > | Rcpp::traits::wrap_type_unknown_tag) [with T = arma::Col<double>]’
| > | > |
| > | >
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp/internal/wrap.h:541:
| > | > | instantiated from ‘SEXPREC* Rcpp::wrap(const T&) [with T =
| > | > | arma::Col<double>]’
| > | > |
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp/Named.h:54:
| > | > | instantiated from ‘Rcpp::Named::Named(const std::string&, const T&)
| > [with
| > | > T
| > | > | = arma::colvec]’
| > | > | RcppArmadilloEg.cpp:19:   instantiated from here
| > | > |
| > | >
| > /home/abhisek/R/i486-pc-linux-gnu-library/2.10/Rcpp/lib/Rcpp/internal/wrap.h:394:
| > | > | error: cannot convert ‘const arma::Col<double>’ to ‘SEXPREC*’ in
| > | > | initialization
| > | > | make: *** [RcppArmadilloEg.o] Error 1
| > | > |
| > | > |
| > | > | could someone provide some advice?
| > | >
| > | > Which Rcpp version do you have installed?
| > | >
| > | > Which Armadillo version do you have installed?
| > | >
| > | > I have not tried the free-floating direct compile you try here.  Maybe
| > the
| > | > defines for RcppArmadillo that we use are missing here -- hard to say.
| > | >
| > | > Could you try to create your own little package but copying the
| > | > RcppArmadillo
| > | > files, changes DESCRIPTION to what you do and changes the FastLM code
| > in
| > | > C++
| > | > and R?
| > | >
| > | > Dirk
| > | >
| > | > --
| > | >  Registration is open for the 2nd International conference R / Finance
| > 2010
| > | >  See http://www.RinFinance.com for details, and see you in Chicago in
| > | > April!
| > | >
| >
| > --
| >   Registration is open for the 2nd International conference R / Finance
| > 2010
| >  See http://www.RinFinance.com for details, and see you in Chicago in
| > April!
| >

-- 
  Registration is open for the 2nd International conference R / Finance 2010
  See http://www.RinFinance.com for details, and see you in Chicago in April!


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