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Newsgroups: comp.graphics.apps.gnuplot
Date: Sat, 20 Oct 2012 19:22:33 -0700 (PDT)
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Subject: accesssing shell array variable with a gnuplot loop index
From: fh.faraz.hussain@gmail.com
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Xref: csiph.com comp.graphics.apps.gnuplot:1422

Hello all,

I need to use shell variables in my gnuplot commands, for which I'm using t=
he here document style. I also need to use loops inside the gnuplot code. B=
oth these things are working.

Now -- I want to use a gnuplot for loop's index to access a shell array var=
iable. This is where I've been stuck all day.

I have something like this:

for ((i=3D0; i<=3D10; i++))
do
var[$i] =3D i*10
done

gnuplot<<EOF
do for [j=3D1:10]{
#need to access ${var[j]} somehow
val=3Dsprintf("${var[%d]", j) ##doesn't work
}
EOF

(Individual access like ${var[1]} works.)=20

I thought of first storing the *name* of the shell variable somewhere and t=
hen dereferencing it (using $), but didn't work.=20

I suspect this may need using backquotes and/or expr, but am not sure. The =
manual mentions the 'value' command which seems to be what would be require=
d here, but I couldn't get it to work. The 'evaluate' command also looks re=
levant. I have been reading the bash and gnuplot manuals -- have learned a =
lot the past few hours, but couldn't solve the problem.


Best
Faraz