Sockets error

[michal.kolar]

Bug report for Octave 3.2.2 configured for i686-pc-mingw32

Description:
-----------

I have installed Octave with sockets package and run simple script for testing sockets. I get the following error:

error: `AF_INET' undefined near line 10 column 17
error: evaluating argument list element number 1
error: evaluating argument list element number 1
error: called from:
error:   simpletest1.m at line 10, column 8

Repeat-By:
---------

The content of simpletest1.m file:

 clear all
 close all
 

 page_screen_output(0);
 fail = 0;

 # Create the sockets
 ## Server socket
 server = socket(AF_INET, SOCK_STREAM, 0);
 if ( server < 0 )
   ++fail;
%    return
 end

 rc = bind(server,20000);
 if ( rc ~= 0 )
   ++fail;
%    return
 end

 rc = listen(server,1);
 if ( rc ~= 0 )
   ++fail;
%    return
 end

 ## Client socket
 client = socket(AF_INET, SOCK_STREAM, 0);
 if ( client < 0 )
   ++fail;
%    return
 end

 # Create the connection and accept the connection
 server_info = struct("addr", "127.0.0.1", "port", 20000);
 rc = connect(client, server_info);
 if ( rc ~= 0 )
   ++fail;
%    return
 end

 server_data = accept(server);
 if ( server_data < 0 )
   ++fail;
%    return
 end

 for ijk=1:10000
 # Send and receive data

 ## Send as string from client
 msg = "Hello socket-land!";
 rc = send(client, msg);
 if ( rc ~= length(msg) )
   ++fail;
%    return
 end

 ## Receive at server
 [msg_s, len_s] = recv(server_data, 100);
 if ( msg_s == -1 || len_s ~= length(msg) )
   ++fail;
%    return
 end

 ## Send back out from server
 rc = send(server_data, msg_s);
 if ( rc ~= length(msg_s) )
   ++fail;
%    return
 end

 ## Receive at client
 [msg_c, len_c] = recv(client, 100);
 if ( msg_c == -1 || len_c ~= length(msg) )
   ++fail;
%    return
 end

 ## Compare original string with recv string
 msg_in = num2str(msg_c, '%c');
 if ( msg_in ~= msg )
   ++fail;
%    return
 end
 end
 
 disconnect(client);
 disconnect(server_data);
 disconnect(server);


printf('Number of failures: %d\n', fail);




Configuration (please do not edit this section):
-----------------------------------------------

uname output:     Windows
configure opts:  
Fortran compiler: mingw32-gfortran-4.3.0-dw2
FFLAGS:           -O -mieee-fp
FLIBS:            -lgfortran
CPPFLAGS:         -march=i686 -mtune=generic -O2
INCFLAGS:         -I. -I/octmgw32/octave/octave-3.2.2 -I. -I./liboctave -I./src -I./libcruft/misc -I/octmgw32/octave/octave-3.2.2 -I/octmgw32/octave/octave-3.2.2/liboctave -I/octmgw32/octave/octave-3.2.2/src -I/octmgw32/octave/octave-3.2.2/libcruft/misc
C compiler:       mingw32-gcc-4.3.0-dw2, version4.3.0-dw2 (GCC TDM-2 for MinGW)
CFLAGS:           -Wall
CPICFLAG:        
C++ compiler:     mingw32-g++-4.3.0-dw2, version4.3.0-dw2
CXXFLAGS:         -D_DLL -Wall
CXXPICFLAG:      
LD_CXX:           mingw32-g++-4.3.0-dw2
LDFLAGS:          -shared-libgcc -Wl,--exclude-libs=-lstdc++_s -Wl,--allow-multiple-definition
LIBFLAGS:         -L.
RLD_FLAG:        
BLAS_LIBS:        -llapack -lblas
FFTW_LIBS:        -lfftw3 -lfftw3f
LIBS:             -lreadline  -lncurses -liberty -lblas -lhdf5 -lz -lm  -lgdi32 -lws2_32 -luser32 -lkernel32
LEXLIB:          
LIBGLOB:          -lglob
SED:              /usr/bin/sed
DEFS:
-DPACKAGE_NAME="" -DPACKAGE_TARNAME="" -DPACKAGE_VERSION="" -DPACKAGE_STRING="" -DPACKAGE_BUGREPORT="" -DOCTAVE_SOURCE=1 -D_GNU_SOURCE=1 -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -D__EXTENSIONS__=1 -D_POSIX_PTHREAD_SEMANTICS=1 -D_TANDEM_SOURCE=1 -DSEPCHAR=';' -DSEPCHAR_STR=";" -D__NO_MATH_INLINES=1 -DCXX_NEW_FRIEND_TEMPLATE_DECL=1 -DCXX_ISO_COMPLIANT_LIBRARY=1 -DHAVE_X_WINDOWS=1 -DHAVE_LIBM=1 -DHAVE_QHULL=1 -DHAVE_PCRE_COMPILE=1 -DHAVE_PCRE=1 -DHAVE_REGEX=1 -DHAVE_ZLIB_H=1 -DHAVE_ZLIB=1 -DHAVE_HDF5_H=1 -DHAVE_HDF5=1 -DHAVE_H5GGET_NUM_OBJS=1 -DHAVE_FFTW3=1 -DHAVE_GLPK_GLPK_H=1 -DHAVE_GLPK=1 -DHAVE_CURL_CURL_H=1 -DHAVE_CURL=1 -DHAVE_MAGICK=1 -DHAVE_WINDOWS_H=1 -DHAVE_GL_GL_H=1 -DHAVE_GL_GLU_H=1 -DHAVE_OPENGL=1 -DHAVE_FTGL_FTGL_H=1 -DHAVE_FTGL=1 -DHAVE_FLTK=1 -DHAVE_IEEE754_DATA_FORMAT=1 -DF77_FUNC(name,NAME)=name ## _ -DF77_FUNC_(name,NAME)=name ## _ -DHAVE_BLAS=1 -DHAVE_QRUPDATE=1 -DHAVE_SUITESPARSE_AMD_H=1 -DHAVE_AMD=1 -DHAVE_SUITESPARSE_UMFPACK_H=1 -DHAVE_UMFPACK=1 -DUMFPACK_SEPARATE_SPLIT=1 -DHAVE_SUITESPARSE_COLAMD_H=1 -DHAVE_COLAMD=1 -DHAVE_SUITESPARSE_CCOLAMD_H=1 -DHAVE_CCOLAMD=1 -DHAVE_SUITESPARSE_CHOLMOD_H=1 -DHAVE_CHOLMOD=1 -DHAVE_SUITESPARSE_CS_H=1 -DHAVE_CXSPARSE=1 -DHAVE_ARPACK=1 -Duid_t=int -Dgid_t=int -DHAVE_DEV_T=1 -DHAVE_INO_T=1 -DHAVE_LONG_LONG_INT=1 -DHAVE_UNSIGNED_LONG_LONG_INT=1 -DHAVE_SIGSET_T=1 -DHAVE_SIG_ATOMIC_T=1 -DSIZEOF_SHORT=2 -DSIZEOF_INT=4 -DSIZEOF_LONG=4 -DSIZEOF_LONG_LONG=8 -DHAVE_ALLOCA=1 -DHAVE_PLACEMENT_DELETE=1 -DHAVE_DYNAMIC_AUTO_ARRAYS=1 -DHAVE_FAST_INT_OPS=1 -DSIZEOF_LONG_DOUBLE=12 -DSTDC_HEADERS=1 -DHAVE_DIRENT_H=1 -DTIME_WITH_SYS_TIME=1 -DHAVE_ASSERT_H=1 -DHAVE_CURSES_H=1 -DHAVE_DIRECT_H=1 -DHAVE_FCNTL_H=1 -DHAVE_FLOAT_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_LIMITS_H=1 -DHAVE_LOCALE_H=1 -DHAVE_MEMORY_H=1 -DHAVE_NCURSES_H=1 -DHAVE_PTHREAD_H=1 -DHAVE_STDINT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_SYS_PARAM_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_SYS_TIME_H=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_UTIME_H=1 -DHAVE_TERMCAP_H=1 -DHAVE_UNISTD_H=1 -DHAVE_UTIME_H=1 -DHAVE_SSTREAM=1 -DHAVE_GLOB_H=1 -DHAVE_FNMATCH_H=1 -DHAVE_CONIO_H=1 -DHAVE_ATEXIT=1 -DHAVE_BASENAME=1 -DHAVE_CHMOD=1 -DHAVE_DUP2=1 -DHAVE_EXECVP=1 -DHAVE_EXPM1=1 -DHAVE_EXPM1F=1 -DHAVE_FSTAT=1 -DHAVE_GETCWD=1 -DHAVE_GETPID=1 -DHAVE_GETTIMEOFDAY=1 -DHAVE__KBHIT=1 -DHAVE_LGAMMA=1 -DHAVE_LGAMMAF=1 -DHAVE_LOG1P=1 -DHAVE_LOG1PF=1 -DHAVE_MEMMOVE=1 -DHAVE_MKDIR=1 -DHAVE_PUTENV=1 -DHAVE_RAISE=1 -DHAVE_RENAME=1 -DHAVE_RMDIR=1 -DHAVE_ROUNDL=1 -DHAVE_SETLOCALE=1 -DHAVE_SETVBUF=1 -DHAVE_SNPRINTF=1 -DHAVE_STAT=1 -DHAVE_STRCASECMP=1 -DHAVE_STRDUP=1 -DHAVE_STRERROR=1 -DHAVE_STRICMP=1 -DHAVE_STRNCASECMP=1 -DHAVE_STRNICMP=1 -DHAVE_TEMPNAM=1 -DHAVE_TGAMMAF=1 -DHAVE_TRUNC=1 -DHAVE_UMASK=1 -DHAVE_UNLINK=1 -DHAVE_USLEEP=1 -DHAVE_UTIME=1 -DHAVE_VFPRINTF=1 -DHAVE_VSPRINTF=1 -DHAVE_VSNPRINTF=1 -DHAVE__CHMOD=1 -DHAVE__SNPRINTF=1 -DHAVE_DECL_EXP2=1 -DHAVE_DECL_ROUND=1 -DHAVE_DECL_TGAMMA=1 -DHAVE_EXP2=1 -DHAVE_ROUND=1 -DHAVE_TGAMMA=1 -DHAVE_MKSTEMPS=1 -DHAVE_C99_VSNPRINTF=1 -DOCTAVE_HAVE_BROKEN_STRPTIME=1 -D_WIN32_WINNT=0x0403 -DHAVE_LOADLIBRARY_API=1 -DENABLE_DYNAMIC_LINKING=1 -DHAVE_TIMEVAL=1 -DHAVE_CMATH_ISNAN=1 -DHAVE_CMATH_ISNANF=1 -DHAVE_CMATH_ISINF=1 -DHAVE_CMATH_ISINFF=1 -DHAVE_CMATH_ISFINITE=1 -DHAVE_CMATH_ISFINITEF=1 -DHAVE_FINITE=1 -DHAVE_ISNAN=1 -DHAVE_COPYSIGN=1 -DHAVE_SIGNBIT=1 -DHAVE__FINITE=1 -DHAVE__ISNAN=1 -DHAVE__COPYSIGN=1 -DHAVE_DECL_SIGNBIT=1 -DHAVE_ACOSH=1 -DHAVE_ACOSHF=1 -DHAVE_ASINH=1 -DHAVE_ASINHF=1 -DHAVE_ATANH=1 -DHAVE_ATANHF=1 -DHAVE_ERF=1 -DHAVE_ERFF=1 -DHAVE_ERFC=1 -DHAVE_ERFCF=1 -DHAVE_EXP2F=1 -DHAVE_LOG2=1 -DHAVE_LOG2F=1 -DHAVE_HYPOTF=1 -DHAVE_STRUCT_STAT_ST_RDEV=1 -DHAVE_DECL_TZNAME=1 -DHAVE_TZNAME=1 -DMKDIR_TAKES_ONE_ARG=1 -DUSE_READLINE=1 -DRETSIGTYPE=void -DHAVE_DECL_SYS_SIGLIST=0 -DMUST_REINSTALL_SIGHANDLERS=1 -DRETSIGTYPE_IS_VOID=1


User-preferences (please do not edit this section):

EDITOR = C:\Octave\3.2.2_gcc-4.3.0\tools\notepad++\notepad++.exe
EXEC_PATH = C:\Octave\3.2.2_gcc-4.3.0\MINGW32\bin;C:\Octave\3.2.2_gcc-4.3.0\MSYS\bin;C:\Octave\3.2.2_gcc-4.3.0\libexec\octave\3.2.2\site\exec\i686-pc-mingw32;C:\Octave\3.2.2_gcc-4.3.0\libexec\octave\api-v37\site\exec\i686-pc-mingw32;C:\Octave\3.2.2_gcc-4.3.0\libexec\octave\site\exec\i686-pc-mingw32;C:\Octave\3.2.2_gcc-4.3.0\libexec\octave\3.2.2\exec\i686-pc-mingw32;C:\Octave\3.2.2_gcc-4.3.0\bin;C:\Program Files\CC386\bin;C:\Program Files\ThinkPad\Utilities;C:\WINNT\system32;C:\WINNT;C:\WINNT\System32\Wbem;C:\Program Files\Intel\Wireless\Bin\;C:\Program Files\Intel\DMIX;C:\Program Files\ThinkPad\ConnectUtilities;C:\Program Files\Common Files\Lenovo;C:\Program Files\Intel\Wireless\Bin\;C:\Program Files\Intel\Wireless\Bin\;C:\Program Files\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Microsoft SQL Server\80\Tools\Binn\;C:\Program Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\Microsoft SQL Server\90\DTS\Binn\;C:\Program Files\Microsoft SQL Server\90\Tools\Binn\VSShell\Common7\IDE\;C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\PrivateAssemblies\;C:\eclipse\workspace\;C:\cygwin\bin\;C:\Program Files\ABB\OEM-MB3000AcquisitionServer\Bodriv\
IMAGE_PATH = .;C:\Octave\3.2.2_gcc-4.3.0\share\octave\3.2.2\imagelib
PAGER = C:\Octave\3.2.2_gcc-4.3.0\bin\less.exe
PS1 = \s:\#:\w
>
PS2 = >
PS4 = +
beep_on_error = 0
completion_append_char =  
crash_dumps_octave_core = 1
echo_executing_commands = 0
fixed_point_format = 0
gnuplot_binary = C:\Octave\3.2.2_gcc-4.3.0\bin\gnuplot.exe
# gnuplot_command_end = <no value or error in displaying it>
# gnuplot_command_plot = <no value or error in displaying it>
# gnuplot_command_replot = <no value or error in displaying it>
# gnuplot_command_splot = <no value or error in displaying it>
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# gnuplot_command_using = <no value or error in displaying it>
# gnuplot_command_with = <no value or error in displaying it>
history_file = C:\Documents and Settings\czmikol1\.octave_hist
history_size = 1024
ignore_function_time_stamp = system
info_file = C:\Octave\3.2.2_gcc-4.3.0\share\info\octave.info
info_program = info
makeinfo_program = makeinfo
max_recursion_depth = 256
output_max_field_width = 5
output_precision = 5
page_output_immediately = 0
page_screen_output = 1
# print_answer_id_name = <no value or error in displaying it>
print_empty_dimensions = 1
save_precision = 16
saving_history = 1
sighup_dumps_octave_core = 1
sigterm_dumps_octave_core = 1
silent_functions = 0
split_long_rows = 1
string_fill_char =  
struct_levels_to_print = 2
suppress_verbose_help_message = 0


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[Benjamin Lindner]

michal.kolar@... wrote:

>
> Bug report for Octave 3.2.2 configured for i686-pc-mingw32
>
> Description:
> -----------
>
> I have installed Octave with sockets package and run simple script for
> testing sockets. I get the following error:
>
> error: `AF_INET' undefined near line 10 column 17
> error: evaluating argument list element number 1
> error: evaluating argument list element number 1
> error: called from:
> error:   simpletest1.m at line 10, column 8
>
> Repeat-By:
> ---------
>
> The content of simpletest1.m file:
>
>  clear all
>  close all
>  
>
>  page_screen_output(0);
>  fail = 0;
>
>  # Create the sockets
>  ## Server socket
>  server = socket(AF_INET, SOCK_STREAM, 0);
>  if ( server < 0 )
>    ++fail;
> %    return
>  end
>

I'm not an expert on the sockets topic, but you did indeed not define
the variable AF_INET in your simpletest1.m script, so you are getting an
"undefined" error.
What value is AF_INET supposed to hold?

benjamin

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[John Swensen]

On Sep 1, 2009, at 2:38 PM, Benjamin Lindner wrote:

> michal.kolar@... wrote:
>>
>> Bug report for Octave 3.2.2 configured for i686-pc-mingw32
>>
>> Description:
>> -----------
>>
>> I have installed Octave with sockets package and run simple script  
>> for
>> testing sockets. I get the following error:
>>
>> error: `AF_INET' undefined near line 10 column 17
>> error: evaluating argument list element number 1
>> error: evaluating argument list element number 1
>> error: called from:
>> error:   simpletest1.m at line 10, column 8
>>
>> Repeat-By:
>> ---------
>>
>> The content of simpletest1.m file:
>>
>> clear all
>> close all
>>
>>
>> page_screen_output(0);
>> fail = 0;
>>
>> # Create the sockets
>> ## Server socket
>> server = socket(AF_INET, SOCK_STREAM, 0);
>> if ( server < 0 )
>>   ++fail;
>> %    return
>> end
>>
>
> I'm not an expert on the sockets topic, but you did indeed not define
> the variable AF_INET in your simpletest1.m script, so you are  
> getting an
> "undefined" error.
> What value is AF_INET supposed to hold?
>
> benjamin
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008  
> 30-Day
> trial. Simplify your report design, integration and deployment - and  
> focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Octave-dev mailing list
> Octave-dev@...
> https://lists.sourceforge.net/lists/listinfo/octave-dev

When I originally wrote this, I think all these things were defined in  
the PKG_ADD function.  Then I think someone suggested I move them into  
the .cc file as DEFUNX_DLD calls.  In fact, there is a macro in there  
as follows

// This macro must start with DEFUN_DLD so that the automatic collection
// of function helps can take place.
#define DEFUN_DLD_SOCKET_CONSTANT(name, help ) \
DEFUNX_DLD ( #name, F ## name, FS ## name, args, nargout, help) \
{ return octave_value( name ); };


It does seem strange that the readline autocompletion thinks that  
AF_INET exists, but I get the same error when trying to access it.  If  
you are in a bind, you can look at the <sys/socket.h> header file and  
use the integer equivalent.  If someone has a suggestion on how to fix  
this, I will make the changes.  I also promise to fix the  
documentation so it says something better than "See the socket() man  
pages".

John Swensen



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[Paul Sundvall]

Hi,
I also had problems with AF_INET not defined. It was due to the F or GS
prefix in the macro, which seems to have changed from 3.0->3.2. I tried
fixing it in the code (see the latest
commits in sockets.cc). The fix is quite ugly and works for me, but I
would be glad if someone else on a platform!=debian tries it. See my
request for comment on mail "versio macros" from August 27:th on the
oct-dev mailing list.

I also updated the documentation so it says more than "see man page".

Please try with the latest version from the repository, and tell me (and
the oct-dev list) if it worked.

Thanks,
Paul Sundvall

John Swensen skrev:

> On Sep 1, 2009, at 2:38 PM, Benjamin Lindner wrote:
>
>> michal.kolar@... wrote:
>>> Bug report for Octave 3.2.2 configured for i686-pc-mingw32
>>>
>>> Description:
>>> -----------
>>>
>>> I have installed Octave with sockets package and run simple script  
>>> for
>>> testing sockets. I get the following error:
>>>
>>> error: `AF_INET' undefined near line 10 column 17
>>> error: evaluating argument list element number 1
>>> error: evaluating argument list element number 1
>>> error: called from:
>>> error:   simpletest1.m at line 10, column 8
>>>
>>> Repeat-By:
>>> ---------
>>>
>>> The content of simpletest1.m file:
>>>
>>> clear all
>>> close all
>>>
>>>
>>> page_screen_output(0);
>>> fail = 0;
>>>
>>> # Create the sockets
>>> ## Server socket
>>> server = socket(AF_INET, SOCK_STREAM, 0);
>>> if ( server < 0 )
>>>   ++fail;
>>> %    return
>>> end
>>>
>> I'm not an expert on the sockets topic, but you did indeed not define
>> the variable AF_INET in your simpletest1.m script, so you are  
>> getting an
>> "undefined" error.
>> What value is AF_INET supposed to hold?
>>
>> benjamin
>>
>> ------------------------------------------------------------------------------
>> Let Crystal Reports handle the reporting - Free Crystal Reports 2008  
>> 30-Day
>> trial. Simplify your report design, integration and deployment - and  
>> focus on
>> what you do best, core application coding. Discover what's new with
>> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
>> _______________________________________________
>> Octave-dev mailing list
>> Octave-dev@...
>> https://lists.sourceforge.net/lists/listinfo/octave-dev
>
> When I originally wrote this, I think all these things were defined in  
> the PKG_ADD function.  Then I think someone suggested I move them into  
> the .cc file as DEFUNX_DLD calls.  In fact, there is a macro in there  
> as follows
>
> // This macro must start with DEFUN_DLD so that the automatic collection
> // of function helps can take place.
> #define DEFUN_DLD_SOCKET_CONSTANT(name, help ) \
> DEFUNX_DLD ( #name, F ## name, FS ## name, args, nargout, help) \
> { return octave_value( name ); };
>
>
> It does seem strange that the readline autocompletion thinks that  
> AF_INET exists, but I get the same error when trying to access it.  If  
> you are in a bind, you can look at the <sys/socket.h> header file and  
> use the integer equivalent.  If someone has a suggestion on how to fix  
> this, I will make the changes.  I also promise to fix the  
> documentation so it says something better than "See the socket() man  
> pages".
>
> John Swensen
>
>
>
> ------------------------------------------------------------------------------
> Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
> trial. Simplify your report design, integration and deployment - and focus on
> what you do best, core application coding. Discover what's new with
> Crystal Reports now.  http://p.sf.net/sfu/bobj-july
> _______________________________________________
> Octave-dev mailing list
> Octave-dev@...
> https://lists.sourceforge.net/lists/listinfo/octave-dev

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[John Swensen]

On Sep 2, 2009, at 2:06 AM, Paul Sundvall wrote:

> Hi,
> I also had problems with AF_INET not defined. It was due to the F or  
> GS
> prefix in the macro, which seems to have changed from 3.0->3.2. I  
> tried
> fixing it in the code (see the latest
> commits in sockets.cc). The fix is quite ugly and works for me, but I
> would be glad if someone else on a platform!=debian tries it. See my
> request for comment on mail "versio macros" from August 27:th on the
> oct-dev mailing list.
>
> I also updated the documentation so it says more than "see man page".
>
> Please try with the latest version from the repository, and tell me  
> (and
> the oct-dev list) if it worked.
>
> Thanks,
> Paul Sundvall
>

This also works on OSX now also.  Thanks for updating that; it really  
needed it.  If I make some more updates to the documentation to  
include some examples, can you check them in?  I don't think I have  
write access to the OctaveForge SVN.

As a side note to the whole list, is the a generally accepted way/
location to have packages install a demo/test function for users to  
reference when trying to write their own scripts based on the  
functions provided by a package?

John Swensen

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[Søren Hauberg]

ons, 02 09 2009 kl. 14:33 -0400, skrev John Swensen:
> As a side note to the whole list, is the a generally accepted way/
> location to have packages install a demo/test function for users to  
> reference when trying to write their own scripts based on the  
> functions provided by a package?

I might be misunderstanding your question, but isn't that what the '%!
demo' mechanisms are there for?

Søren


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