gnuplot-info

[Gnuplot-info] keep one window

[Shuxia Z. <sz...@ms...>]

I tried to use gnuplot to disply a set of x-y plots
on ONE frame/window, instead of poping more windows.
And I cannot merger fplot1 with flot0 since it was
not generated yet. (A real time data display.)

Here is what I did:

gnuplot -persist -clear -tvtwm < fplot0
gnuplot -persist -clear -tvtwm < fplot1
gnuplot -persist -clear -tvtwm < fplot1

where fplot0 contains

    plot    "force.dat" using 1:2 title 'Column' with linespoints
    save 'my.plt';

and fplot1 contains

  load 'my.plt';
  replot    "force.dat" using 1:2 title 'Column' with linespoints

I thought it should work, but it did not. Still poping more
windows.

Does anybody have a better idea?

Thanks,

Shuxia Zhang

Re: [Gnuplot-info] keep one window

[<br...@ph...>]

Shuxia Zhang wrote:

> I tried to use gnuplot to disply a set of x-y plots
> on ONE frame/window, instead of poping more windows.

That's actually quite simple: you do that by not restarting gnuplot for 
every plot.  You have to keep a gnuplot process open, and generate fresh 
plots by sending it new commands from time to time, typically through a 
pipe fed by another process.

> gnuplot -persist -clear -tvtwm < fplot0
> gnuplot -persist -clear -tvtwm < fplot1
> gnuplot -persist -clear -tvtwm < fplot1

-persist is exactly the option you should not use.  That's used to keep
gnuplot's graph windows open indefinitely.  That's working in the exact
opposite direction of what you were trying to do.

> where fplot0 contains
> 
>    plot    "force.dat" using 1:2 title 'Column' with linespoints
>    save 'my.plt';
> 
> and fplot1 contains
> 
>  load 'my.plt';
>  replot    "force.dat" using 1:2 title 'Column' with linespoints

That doesn't make any sense at all.  That 'replot' doesn't achieve 
anything useful.

Re: [Gnuplot-info] keep one window

[Shuxia Z. <sz...@ms...>]

Thanks for the reply. I know what what you said "
You have to keep a gnuplot process open, and generate
fresh plots by sending it new commands from time to time".
Actually many examples you can find from the web.

My problem is tougher than that. I have a friend
who could get the plot updated on one-window by lauching 
something like this:

  gnuplot -persist -clear -tvtwm < fplot0
  gnuplot -persist -clear -tvtwm < fplot1
  gnuplot -persist -clear -tvtwm < fplot1

But now it does not work any more. We could not figure out
what is the cause.

Any ideas?

Shuxia

Re: [Gnuplot-info] keep one window

[<br...@ph...>]

Shuxia Zhang wrote:

> My problem is tougher than that. I have a friend
> who could get the plot updated on one-window by lauching something like 
> this:
> 
>  gnuplot -persist -clear -tvtwm < fplot0
>  gnuplot -persist -clear -tvtwm < fplot1
>  gnuplot -persist -clear -tvtwm < fplot1

I'm quite sure that this ever working was an illusion, caused by not 
looking close enough to notice the differences.  The above will open 
*three* windows, and leave behind three gnuplot_x11 processes.  They may 
show up all in the same place, on top of each other, so they could be 
hard to distinguish, but they're there.

> But now it does not work any more. We could not figure out
> what is the cause.

Start with temporal coincidence then: what did he change to his system 
when this stopped working?