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[Octave-bug-tracker] [bug #34567] Ridges in smooth plot


From: Peter Jeffris
Subject: [Octave-bug-tracker] [bug #34567] Ridges in smooth plot
Date: Sun, 16 Oct 2011 22:12:24 +0000
User-agent: Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20100101 Firefox/7.0.1

URL:
  <http://savannah.gnu.org/bugs/?34567>

                 Summary: Ridges in smooth plot
                 Project: GNU Octave
            Submitted by: jeffris
            Submitted on: Sun 16 Oct 2011 10:12:23 PM GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: peter
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.2.4
        Operating System: GNU/Linux

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Details:

When ploting ridges appear either above or below the surface which I'm pretty
confident should be smooth. The  sign reflects where the slope is increasing
or decreasing and they seem to follow the line y=x. 
octave:22> [x,y] = meshgrid(-2*pi:.2:2*pi);
octave:23> z = e**(x).*cos(y)
octave:24> surf(x,y,z)

Increasing the size of the polygons does not help
octave:28> [x,y] = meshgrid(-2*pi:1:2*pi);
octave:29> z = e**(x).*cos(y);
octave:30> surf(x,y,z)
but another bug shows up where the tiles in the middle do not stay opaque when
viewed from certain angles.




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  <http://savannah.gnu.org/bugs/?34567>

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