__gnuplot_get_var__.m seems to fail while building documentation

[Thomas Treichl]

Ben Abbott schrieb:
> 
> On Apr 11, 2009, at 4:36 PM, Thomas Treichl wrote:
> 
>> Hi,
>>
>> I currently have the problem on MacOSX that I can't make the 
>> documentation right
>> after compilation. The version that I tried to build is:
>>
>>   $ hg tip
>>   changeset:   9110:22ae6b3411a7
>>   tag:         tip
>>   user:        David Bateman <dbateman at free.fr>
>>   date:        Sat Apr 11 16:26:01 2009 +0200
>>
>> The error output is:
>>
>>   makeinfo -I.. -I. -I./.. ./octave.texi
>>   ../../run-octave -f -q -H -p . --eval "sparseimages ('gplot', 'eps');"
>>   ans = [](0x0)
>>   error: __gnuplot_get_var__: stream to gnuplot not open
>>   error: called from:
>>   error:   
>> /Users/Thomas/Development/octave/scripts/plot/__gnuplot_get_var__.m
>>   at line 47, column 5
>>   error:   
>> /Users/Thomas/Development/octave/doc/interpreter/sparseimages.m at
>>   line 54, column 3
>>   error:   
>> /Users/Thomas/Development/octave/doc/interpreter/sparseimages.m at
>>   line 30, column 2
>>   make[3]: *** [gplot.eps] Error 1
>>   make[2]: *** [interpreter] Error 2
>>   make[1]: *** [doc] Error 2
>>   make: *** [all] Error 2
>>
>> I then had a look at __gnuplot_get_var__.m line 40 and removed the 
>> semicolon of
>> this line: ostream always seems to be an empty matrix. Nect I put a 
>> "get (h)"
>> right before line 40 and found out that there is no __plot_stream__ 
>> option
>> available in the return value of "get (h)". Any ideas?
>>
>> Thanks,
>>
>>   Thomas
> 
> I assume this happens with the "visible" property is "off" ?
> 
> I'm guessing that the error actually should trace back to print.m ?
> 
> $ fgrep -in __gnuplot_get_var__ *.m
> __gnuplot_get_var__.m:20:## @deftypefn {Function File} {@var{value} =} 
> __gnuplot_get_var__ (@var{h}, @var{name}, @var{fmt})
> __gnuplot_get_var__.m:27:function gp_var_value = __gnuplot_get_var__ (h, 
> gp_var_name, fmt)
> __gnuplot_get_var__.m:45:    error ("__gnuplot_get_var__: stream to 
> gnuplot not open");
> __gnuplot_get_var__.m:48:      error ("__gnuplot_get_var__: Need mkfifo 
> that is not implemented under Windows");
> __gnuplot_get_var__.m:65:      error ("__gnuplot_get_var__: Can not make 
> fifo (%s)", msg);
> __gnuplot_get_var__.m:89:        error ("__gnuplot_get_var__: Can not 
> open fifo.");
> gnuplot_drawnow.m:46:        available_terminals = __gnuplot_get_var__ 
> (plot_stream, "GPVAL_TERMINALS");
> print.m:407:        available_terminals = __gnuplot_get_var__ (gcf, 
> "GPVAL_TERMINALS");
> 
> A simple example ...
> 
> octave:1> 
> figure(1);set(gcf,'visible','off');plot(1:10);print(gcf,'-dpdf','test.pdf')
> error: __gnuplot_get_var__: stream to gnuplot not open
> error: called from:
> error:   
> /Users/bpabbott/Development/mercurial/local_clone/scripts/plot/__gnuplot_get_var__.m 
> at line 45, column 5
> 
> Thomas, what version of gnuplot are you running ... If not the 
> developers sources then I'm confused.
> 
> A simple fix would be to check that the "visible" property is "on" 
> before relying on __gnuplot_get_var__. If there are no objections, I'll 
> create a changeset.
> 
> On another point, any chance the error can be made to trace back 
> correctly? Meaning that the error Thomas found does not mention 
> "print.m", but a call to print.m results in this error?
> 
>  48 function gplotimages (nm, typ)
>  49   bury_output ();
>  50   A = sparse ([2,6,1,3,2,4,3,5,4,6,1,5],
>  51               [1,1,2,2,3,3,4,4,5,5,6,6], 1, 6, 6);
>  52   xy = [0,4,8,6,4,2;5,0,5,7,5,7]';
>  53   gplot (A, xy)
>  54   print (cstrcat (nm, ".", typ), cstrcat ("-d", typ))
>  55   bury_output ();
>  56 endfunction

Hi Ben,

thanks for your help. You're right, I am 'was' using 4.3 patchlevel 0. I 
switched back to 4.2.5 and now the creation of the doc works very well. Is it 
currently better to use a Gnuplot of the 4.2.x series?

If I once again check with Gnuplot 4.3.0 then there is the "visibility" property 
set "off", yes right.

Don't know why we don't see the trace back of print.m, you're right, if I put a 
keyboard statement to line 40 of __gnuplot_get_var__.m and then use the dbstack 
function I see

   debug> vdbs = dbstack ();
   debug> vdbs(:).name
   ans = __gnuplot_get_var__
   ans = print
   ans = sparseimages>gplotimages
   ans = sparseimages
   debug>

Best regards,

   Thoams