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GNU Plot doubt

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Old   February 27, 2007, 15:11
Default GNU Plot doubt
  #1
Renato.
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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?

Thanks

Renato.

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Old   February 27, 2007, 16:37
Default Re: GNU Plot doubt
  #2
Balduin Bankerotti
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c Fortran-gnuplot interaction for real-time animation using named pipe
c
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
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
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
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 chernysh@soton.ac.uk (Sergei Chernyshenko) or
c by other means, see http://www.afm.ses.soton.ac.uk/ -> People.
c
c How to use:
c
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
c do not use too many frames per second, the computer may hang.
c
c second(x) gives the CPU time in seconds. Replace if unavailable.

nframe=0
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\''
close(1)
1 call second(x)
c 15 frames per second:
if(15*x.gt.nframe) then
nframe=nframe+1
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
i=(x/10)
i=i*10
write(1,*) (x-i)/10.
write(1,*) 0.7
write(1,*) 0.8
write(1,*) 0.9
write(1,*) 'e'
close(1)
endif
goto 1
stop
end
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