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Newsgroups: comp.graphics.apps.gnuplot
Date: Sun, 21 Oct 2012 13:59:55 -0700 (PDT)
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Subject: Re: 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:1423

Hello,

I got this to work by using "${var[*]}":=20

http://unix.stackexchange.com/questions/52453/gnuplot-shell-variable-substi=
tution-and-arrays

Best
Faraz

On Saturday, October 20, 2012 10:22:33 PM UTC-4, fh.faraz...@gmail.com wrot=
e:
> Hello all,
>=20
>=20
>=20
> I need to use shell variables in my gnuplot commands, for which I'm using=
 the here document style. I also need to use loops inside the gnuplot code.=
 Both these things are working.
>=20
>=20
>=20
> Now -- I want to use a gnuplot for loop's index to access a shell array v=
ariable. This is where I've been stuck all day.
>=20
>=20
>=20
> I have something like this:
>=20
>=20
>=20
> for ((i=3D0; i<=3D10; i++))
>=20
> do
>=20
> var[$i] =3D i*10
>=20
> done
>=20
>=20
>=20
> gnuplot<<EOF
>=20
> do for [j=3D1:10]{
>=20
> #need to access ${var[j]} somehow
>=20
> val=3Dsprintf("${var[%d]", j) ##doesn't work
>=20
> }
>=20
> EOF
>=20
>=20
>=20
> (Individual access like ${var[1]} works.)=20
>=20
>=20
>=20
> I thought of first storing the *name* of the shell variable somewhere and=
 then dereferencing it (using $), but didn't work.=20
>=20
>=20
>=20
> I suspect this may need using backquotes and/or expr, but am not sure. Th=
e manual mentions the 'value' command which seems to be what would be requi=
red here, but I couldn't get it to work. The 'evaluate' command also looks =
relevant. I have been reading the bash and gnuplot manuals -- have learned =
a lot the past few hours, but couldn't solve the problem.
>=20
>=20
>=20
>=20
>=20
> Best
>=20
> Faraz