gnuplot-info

[Gnuplot-info] Pgnuplot again

[Teodoro S. <te...@ii...>]

Hi!

This is how I'm supposed to work with pgnuplot.exe:

FILE * plot_pipe =3D _popen("pgnuplot.exe", "w");
fprintf(plot_pipe, "plot x\n");

But when I do this nothing happens...

I did this in desperation:

FILE * plot_pipe =3D _popen("pgnuplot.exe", "w");
for (k=3D0; k<10000; k++)
    fprintf(plot_pipe, "plot x\n");

And it worked!! But it sends "plot x" hundreds of times...
Then if i write another fprintf out of the "for" sentence, it is not =
piped to gnuplot.

I'm totally lost. How can I work with pgnuplot.exe in a "clean" way??

Re: [Gnuplot-info] Pgnuplot again

[Hans-Bernhard B. <br...@ph...>]

Teodoro Seoane wrote:
> This is how I'm supposed to work with pgnuplot.exe:
>  
> FILE * plot_pipe = _popen("pgnuplot.exe", "w");
> fprintf(plot_pipe, "plot x\n");
>  
> But when I do this nothing happens...

In that case, it appears your implementation is setting this pipe to 
fully buffered mode, and you have to explicity flush the buffer for the 
command to actually be sent.  You do that by following the above 
sequence by a

	fflush(plot_pipe);

Do that after every group of commands, but in particular after every 
'plot' or other command that you want executed immediately.

-- 
Hans-Bernhard Broeker (br...@ph...)
Even if all the snow were burnt, ashes would remain.