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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: Problems with ellipse object
Date: Tue, 18 Apr 2017 13:12:29 +0200
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Am 18.04.2017 um 11:53 schrieb Francisco Pontiga:
> Things become worse when I try to use a log scale for the z-axis. If I write

> set log z
> set object 1 ellipse at 0.0,0.0 size 0.5,0.5 angle 0 front fillcolor rgbcolor "white"
> splot [-2:2][-2:2] x**2+y**2 notitle with lines
> 
> I got the following error: "ellipse has z coord of 0; must be above 0 for log scale! "
> 
> How can I modify the z coordinate of the ellipse?

Well, you just can give a bogus positive z coordinate :

  set view map
  set log z
  set object 1 ellipse at 0.0,0.0,1 size 0.5,0.5,1 angle 0 front
  splot [-2:2][-2:2] x**2+y**2 notitle with lines

,  but the error (message) is of course nonsense. File a bug report
about it on https://sourceforge.net/p/gnuplot/bugs ?

  Karl