gnuplot-info

[Gnuplot-info] Plotting data file while writing to it

[Roman K. <ma...@ro...>]

Dear all,

I am writing a tabular seperated data file with a program and would like 
to plot that file while writing it.

I experimented with plot "< cat filename" and also with
mknod pipe p

and writing to that file "pipe" so that I can plot in gnuplot with 
something like
plot "< cat pipe"
or
plot "< tail -f pipe",

but without success. Anyone had this problem and solved it?



Thanks in advance,
Roman Klinger

Re: [Gnuplot-info] Plotting data file while writing to it

[Thomas S. <t.s...@fz...>]

create a file named e.g. plotloop.gpl :

   plot '< tail -n 99 datafile' using ...
   pause 10
   reread

let your program write its data into 'datafile' and start
the loop in gnuplot:

   load 'plotloop.gpl'

every 10 seconds gnuplot will plot the newest 99 datapoints.

gnuplot waits for an end-of-file or for a pipe being closed
before plotting anything, that's why a '< tail -f ...' doesn't work.

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Re: [Gnuplot-info] Plotting data file while writing to it

[Roman K. <ma...@ro...>]

Thomas Sefzick wrote:
>    pause 10
>    reread

Thanks, that's, what I need :-).

Best regards,
Roman