gnuplot-info

[Gnuplot-info] passing comments

[bittersweet <noo...@gm...>]

hi.

how do I pass a comment e.g. plot sin(x) to gnuplot from visual c++?
I have tried to use fprintf but it doesn't work?
Any idea anyone?
Thanks in advance!
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Re: [Gnuplot-info] passing comments

[<HBB...@t-...>]

bittersweet wrote:

> how do I pass a comment e.g. plot sin(x) to gnuplot from visual c++?

Ah, that's a command you want to pass, not a comment.

> I have tried to use fprintf but it doesn't work?

You'll have to explain the context a lot better before we can help you 
with this.  fprintf() is the correct command to use.  The trick is how 
you *opened* that stream you're printing into.  It can be an ordinary 
file which you later pass to gnuplot as a command line argument, or it 
can be a pipe.  Look up system() and _popen() in your library reference 
manual(s).

Re: [Gnuplot-info] passing comments

[bittersweet <noo...@gm...>]

Hi. For the time being, I just want to plot a simple sin(x) graph. Can i put
it in this way?

        FILE *pid;

	pid = _popen ("wgnuplot.exe", "w");

	if (pid < 0)
	{
		perror("Can't open wgnuplot!\n");
	}

	else
	{
		printf("Open file suceeded!\n");
		fprintf(pid, "plot sin(x)");
		system("type wgnuplot.exe");
		_pclose(pid);
	}
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Re: [Gnuplot-info] passing comments

[<HBB...@t-...>]

bittersweet wrote:
> Hi. For the time being, I just want to plot a simple sin(x) graph. Can i put
> it in this way?

Not quite.

>         FILE *pid;
> 
> 	pid = _popen ("wgnuplot.exe", "w");

You have to run pgnuplot instead of wgnuplot here.  That's what it 
exists for.