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Old   February 27, 2007, 15:11
Default GNU Plot doubt
Posts: n/a
Hi folks,

some time ago I did something in GNU Plot that I can't remember. I loaded a data file which was still being written and after each update GNU plot automatically reloaded and refreshed the resulting plot. Does anyone know which command is used for doing it?



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Old   February 27, 2007, 16:37
Default Re: GNU Plot doubt
Balduin Bankerotti
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c Fortran-gnuplot interaction for real-time animation using named pipe
c This is a simple example of how gnuplot can be used to create
c real-time animation of data produced by running fortran 77 code.
c I put it in the searchable directory in a hope that it can be useful,
c but no guarantees of any kind: use it at your own risk. Too many
c frames per second can hang you system heavily.
c To understand how it works, you need to know what a named pipe is, and what
c plot '-' means in gnuplot: read the manuals.
c And, PLEASE, if you know why a.out > FIFOfile works
c but just a.out does not
c even though the gnuplot commands are written to the pipe and not
c to the standard output, send me an explanation to
c (Sergei Chernyshenko) or
c by other means, see -> People.
c How to use:
c at the linux command prompt, type mkfifo FIFOfile
c compile this file and name the executable a.out .
c in an xterm window type gnuplot < FIFOfile
c in another window type a.out > FIFOfile
c enjoy
c do not use too many frames per second, the computer may hang.
c second(x) gives the CPU time in seconds. Replace if unavailable.

open(1,file='FIFOfile', status='unknown')
write(1,*) 'set xrange [-10:10]'
write(1,*) 'set yrange [-2:2]'
write(1,*)'set title \'Demonstrating animation Fortran-gnuplot'
1 ,' via named pipe\''
1 call second(x)
c 15 frames per second:
if(15* then
open(1,file='FIFOfile', status='unknown')
write(1,*) 'plot sin(x-',x,'),',' \'-\' w lp'
write(1,*) 0.2
write(1,*) 0.3
write(1,*) 0.4
write(1,*) 0.5
write(1,*) (x-i)/10.
write(1,*) 0.7
write(1,*) 0.8
write(1,*) 0.9
write(1,*) 'e'
goto 1
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