MATLAB Central Newsreader - compile rosenbrock from c/c++

compile rosenbrock from c/c++

Dave Brackett — Mon, 01 Sep 2008 15:07:01 -0400

I have downloaded some code in c or c++ for the Rosenbrock
optimization algorithm. According to the website, "the code
of the optimizer is standard C and doesn't use any special
libraries", but it may be c++ as the file extension
is .cpp. The website is:
http://iridia.ulb.ac.be/~fvandenb/optimization/rosenbrock.ht
ml

I am trying to compile it for use in Matlab, but get the
following error:

C:\DOCUME~1\mmdjb\LOCALS~1\Temp\mex_JB2Rpz\rosenbrock.obj
LINK : error LNK2001: unresolved external symbol
mexFunction
C:\DOCUME~1\mmdjb\LOCALS~1\Temp\mex_JB2Rpz\templib.x :
fatal error LNK1120: 1 unresolved externals

C:\PROGRA~1\MATLAB\R2008A\BIN\MEX.PL: Error: Link
of 'rosenbrock.mexw64' failed.

??? Error using ==> mex at 207
Unable to complete successfully.

Can anyone else compile it successfully, and if so, how?
Thanks.

p.s. I am trying to compile it on a 64 bit windows xp
system using Matlab 7.6.0 R2008a

Re: compile rosenbrock from c/c++

James Tursa — Mon, 01 Sep 2008 20:39:52 -0400

On Mon, 1 Sep 2008 15:07:01 +0000 (UTC), "Dave Brackett"
<davebrackett@hotmail.com> wrote:

>I have downloaded some code in c or c++ for the Rosenbrock
>optimization algorithm. According to the website, "the code
>of the optimizer is standard C and doesn't use any special
>libraries", but it may be c++ as the file extension
>is .cpp. The website is:
>http://iridia.ulb.ac.be/~fvandenb/optimization/rosenbrock.ht
>ml
>
>I am trying to compile it for use in Matlab, but get the
>following error:
>
>C:\DOCUME~1\mmdjb\LOCALS~1\Temp\mex_JB2Rpz\rosenbrock.obj
>LINK : error LNK2001: unresolved external symbol
>mexFunction
>C:\DOCUME~1\mmdjb\LOCALS~1\Temp\mex_JB2Rpz\templib.x :
>fatal error LNK1120: 1 unresolved externals
>
> C:\PROGRA~1\MATLAB\R2008A\BIN\MEX.PL: Error: Link
>of 'rosenbrock.mexw64' failed.
>
>??? Error using ==> mex at 207
>Unable to complete successfully.
>
>
>Can anyone else compile it successfully, and if so, how?
>Thanks.
>
>p.s. I am trying to compile it on a 64 bit windows xp
>system using Matlab 7.6.0 R2008a
>

The error you are getting means that you have not included the gateway
mexFunction interface to the code. Sounds like you have never used mex
before. My suggestion is to first review the MATLAB help for
mexFunction, then review the help for how to work with mxArray
variables inside a C / C++ program. Then work on writing code to
convert the prhs inputs to C / C++ variables, and then how to convert
your C / C++ variable outputs to plhs variables. Only after you have
done all that will you have a working mex function. If I get some time
later on today I will cook up an example for you using your code.

doc on mexFunction:

http://www.mathworks.com/access/helpdesk/help/techdoc/index.html?/access/helpdesk/help/techdoc/apiref/mexfunction.html&http://www.mathworks.com/cgi-bin/texis/webinator/search/?db=MSS&prox=page&rorder=750&rprox=750&rdfreq=500&rwfreq=500&rlead=250&sufs=0&order=r&is_summary_on=1&ResultCount=10&query=mexFunction&submitButtonName=Search

James Tursa

Re: compile rosenbrock from c/c++

Dave Brackett — Wed, 03 Sep 2008 08:37:01 -0400

James Tursa <aclassyguywithaknotac@hotmail.com> wrote in
message <psjob4l5fv4uk4tt0krncap25didf8f3k6@4ax.com>...
> On Mon, 1 Sep 2008 15:07:01 +0000 (UTC), "Dave Brackett"
> <davebrackett@hotmail.com> wrote:
>
> >I have downloaded some code in c or c++ for the
Rosenbrock
> >optimization algorithm. According to the website, "the
code
> >of the optimizer is standard C and doesn't use any
special
> >libraries", but it may be c++ as the file extension
> >is .cpp. The website is:
>
>http://iridia.ulb.ac.be/~fvandenb/optimization/rosenbrock.h
t
> >ml
> >
> >I am trying to compile it for use in Matlab, but get the
> >following error:
> >
> >C:\DOCUME~1\mmdjb\LOCALS~1
\Temp\mex_JB2Rpz\rosenbrock.obj
> >LINK : error LNK2001: unresolved external symbol
> >mexFunction
> >C:\DOCUME~1\mmdjb\LOCALS~1\Temp\mex_JB2Rpz\templib.x :
> >fatal error LNK1120: 1 unresolved externals
> >
> > C:\PROGRA~1\MATLAB\R2008A\BIN\MEX.PL: Error: Link
> >of 'rosenbrock.mexw64' failed.
> >
> >??? Error using ==> mex at 207
> >Unable to complete successfully.
> >
> >
> >Can anyone else compile it successfully, and if so, how?
> >Thanks.
> >
> >p.s. I am trying to compile it on a 64 bit windows xp
> >system using Matlab 7.6.0 R2008a
> >
>
> The error you are getting means that you have not
included the gateway
> mexFunction interface to the code. Sounds like you have
never used mex
> before. My suggestion is to first review the MATLAB help
for
> mexFunction, then review the help for how to work with
mxArray
> variables inside a C / C++ program. Then work on writing
code to
> convert the prhs inputs to C / C++ variables, and then
how to convert
> your C / C++ variable outputs to plhs variables. Only
after you have
> done all that will you have a working mex function. If I
get some time
> later on today I will cook up an example for you using
your code.
>
> doc on mexFunction:
>
>
http://www.mathworks.com/access/helpdesk/help/techdoc/index.
html?/access/helpdesk/help/techdoc/apiref/mexfunction.html&h
ttp://www.mathworks.com/cgi-bin/texis/webinator/search/?
db=MSS&prox=page&rorder=750&rprox=750&rdfreq=500&rwfreq=500&
rlead=250&sufs=0&order=r&is_summary_on=1&ResultCount=10&quer
y=mexFunction&submitButtonName=Search
>
> James Tursa

i thought i had replied to this but it seems to have gone,
strange. i have used mex before to compile a .c file which
uses the BLAS and LAPACK libraries and that was pretty
straightforward. I have never written gateway code though
and have no experience with C++, so if you could provide an
example relevant to the Rosenbrock code above that would be
really helpful. Thanks.