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From: Ethan A Merritt <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Question about "sprintf" "@" "do for"
Date: Tue, 02 Feb 2016 16:05:25 -0800
Organization: gnuplot development
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Jörg Buchholz wrote:

> Hello,
> 
> this works:
> 
> A1=1
> A2=2
> A3=3
> 
> i=1
> vari=sprintf("A%.f",i)
> print vari,"=",@vari
> i=i+1
> vari=sprintf("A%.f",i)
> print vari,"=",@vari
> i=i+1
> vari=sprintf("A%.f",i)
> print vari,"=",@vari
> 
> do for [i=1:3]{
> vari=sprintf("A%.f",i)
> print vari
> }
> 
> But I want to have "print vari,"=",@vari" in the loop. But it dosen't
> work. Why can't I use "print vari,"=",@vari" in the loop? 

The @ indicates macro expansion, which only happens once.
And that one time is before the loop is executed.
So whatever value @vari has at the start of loop execution, that
is the value it will have every time through.

> Is there a solution for?

You don't need macros for this

  do for [i=1:3] {
    vari = <whatever>
    print vari, ' = ', value(vari)
  }

 
> Jörg