[Octave-bug-tracker] [bug #63704] isosurface returns incorrect results for data bigger than small

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?63704>

                 Summary: isosurface returns incorrect results for data bigger
than small
                 Project: GNU Octave
               Submitter: None
               Submitted: Wed 25 Jan 2023 02:17:51 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: Ladislav Hanyk
        Originator Email: ladislav.hanyk@mff.cuni.cz
             Open/Closed: Open
                 Release: 7.3.0
         Discussion Lock: Any
        Operating System: Microsoft Windows
           Fixed Release: None
         Planned Release: None


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Follow-up Comments:


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Date: Wed 25 Jan 2023 02:17:51 PM UTC By: Anonymous
Matlab and Octave v6 can compute and display isosurfaces that Octave v7
cannot. 

Second example from help isosurface works with N=15 but not with N=60. 

Following example works for nx=40 but not for nx=50.

% Spherical shell
xmax=0.9; nx=50;
vec=linspace(-xmax,xmax,nx);
[x,y,z]=meshgrid(vec,vec,vec);
s=sqrt(x.^2+y.^2+z.^2);
isosurface(x,y,z,s,1);








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