bash: loading presaved variable to gnuplot cmd load

Question

My intention is to have loaded variable i in for cycle - I want to have it usable for this cycle. Current state is that gnuplot loads var i from the first echo as a string not var.

SPEED=5

echo "plot '< head -n \"\$((SPEED*i))\" `echo ${INFILE}`' using 1:3 ;">> file.plt

for ((i=1;i<="$FRAMES";i++))                                     
do      
    echo  " 
        load '`echo ${file.plt}`';  
        " | gnuplot
done

Is using echo in `echo ${INFILE}` and `echo ${INFILE}` necessary? Why don't you just incorporate the variable by itself? — Dennis Williamson
– Dennis Williamson, Commented May 10, 2012 at 10:41
It's not clear what you're looking for - i is your loop iteration variable. Is that the same as the i in the multiplication (SPEED * i)? — Dennis Williamson
– Dennis Williamson, Commented May 10, 2012 at 10:44
Yes, I want to replace i from multiplication by i value from loop — Petr Marek
– Petr Marek, Commented May 10, 2012 at 10:52

mgilson · Accepted Answer · 2012-11-21 12:53:08Z

2

I think you can probably do all of this in gnuplot directly...

if(! exists("N")) N=0
FRAMES=10
FILE='myfile.plt'
SPEED=5
f(i)=sprintf("< head -n %d ".FILE,i+SPEED)
plot f(N) using 1:3
if(N < FRAMES) N=N+1
if(N < FRAMES) reread

Gnuplot 4.6 makes this even easier:

do for [N=1:10]{
   FILE='myfile.plt'
   SPEED=5
   f(i)=sprintf("< head -n %d ".FILE,i+SPEED)
   plot f(N) using 1:3

}

and instead of using head, you can probably use the every datafile modifier (help every for details). I think something like the following:

NPT=N+SPEED
plot FILE every ::::NPT using 1:3

edited Nov 21, 2012 at 12:53

answered May 10, 2012 at 13:03

mgilson

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1 Comment

mgilson Over a year ago

@shelter There's also plot iteration in gnuplot 4.3+, but I think that would have a different result (it would put all the plots on the same graph) as opposed to having each of the plots in their own graph.

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