Re: [Gnuplot-info] Plotting zero on a log scale

[sfeam <eam...@gm...>]

On Monday, 10 November 2014 05:15:38 AM Dave Horsfall wrote:
> I know, it's mathematically impossible (it tends to disappear towards -ve 
> infinity), but bear with me.
> 
> Behold the graph over on www.horsfall.org/spamlog.pdf (about 100k); it's a 
> daily plot of my email logs, and amongst other things it includes the spam 
> that was actually delivered (shown in pink, of course, as opposed to the 
> spam that was rejected in red).  I had to use a logarithmic scale because 
> of the magnitudes involved, which means around 3rd November was a 
> spam-free day (yes, I was surprised as well!).
> 
> It looks ugly, so I would like to re-map "0" into "0.1", but I cannot 
> think of an elegant way of doing this.

An explicit axis label overrides an auto-generated one, so this
should do the trick:

   set ytics add ("0.0" 0.1)
   plot ...

	Ethan


> 
> 1) Conditional expressions in the "plot" command; yuck.
> 
> 2) Something like "if ($7 == 0) $7 = 0.1" before the plot; didn't work.
> 
> 3) Playing with "set zero"; I must've misunderstood how it's used.
> 
> 4) A pre-filter on the data; that amounts to tampering with it.
> 
> So, is there an elegant way to redefine "0" as "0.1", or do I have to 
> pollute the "plot" command?
> 
> Thanks.
> 
>