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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: space between sign and digit
Date: Wed, 11 Jul 2018 10:00:42 +0200
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Am 11.07.2018 um 08:52 schrieb Jörg Buchholz:
> Hello,
> 
> I would like to print a function in the key like this:
> 
> f11(x) = -2.56·x - 103.63
> 
> I use the following code in the plot command for that:
> 
> f11(x) lt 2 lw 4 dt 4 t sprintf("f11(x) =%6.2f·x%+7.2f",a,b11)
> 
> That means, that I use the sign from the format specifier as plus sign
> or minus sing in the printed function. But than I don't have a space in
> front of the second number. The second number can be positive or negative.

sprintf() can't add an extra space in there i think. Following uses the
ternary operator on b11 to check which sign character is needed

plot f11(x) lt 2 lw 4 dt 4 t \
  sprintf("f11(x) =%.2f·x %s %.2f",a,b11<0?"-":"+",abs(b11))