__gnuplot_get_var__.m seems to fail while building documentation

[Ben Abbott]

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

Ben