[Rcpp-devel] RcppArmadillo error

Abhisek shieks at gmail.com
Fri Mar 26 19:00:23 CET 2010 

Hi Dirk,

I was referring to this page:
http://dirk.eddelbuettel.com/code/rcpp.armadillo.html
i was trying to run the code there.

here is my understanding so far (im new to linux and c++ so i apologize for
seeming rather slow!):
1.  The Rcpp package helps C++ and R recognize each others stuff (like
variables).

2. The RcppArmadillo package extends this functionality to objects used in
armadillo (such as matrices and vectors e.g. colvec).

3. In FastLM, armadillo is being included but not RcppArmadillo.  but that
is ok because there is a loop in there which converts an vector as defined
in armadillo to one which Rcpp recognizes.  And it is this vector which
which gets passed back to R through the Rcpp interface.  also, it uses
cfunction which is different from what im doing here as i think you
mentioned earlier (it worked by the way!)

what i tried to do was as follows:
a) to run the code as in the link above and include Rcpp and RcppArmadillo
and I was getting the errors as described in my initial post.
b) then i tried the same code but only including Rcpp and armadillo.

if my reasoning above is correct, part (b) should not run as Rcpp would not
recognize stuff like arma::colvec.  but, i get the exact same error as
above!

so that suggests, that while compiling the code, the compiler is not even
getting to the point in procedure b when it should encounters an type it
doesnt recognize.  which means that somehow, armadillo is giving problems.
but that is as far as i can understand.  either that or my understanding is
way off.

appreciate your patience and help!
abhisek



On Fri, Mar 26, 2010 at 4:20 PM, Dirk Eddelbuettel <edd at debian.org> wrote:

>
> 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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