[Octave-bug-tracker] [bug #52053] GUI becomes unresponsive when using slice() with logical array

[Georg Wiora]

URL:
  <http://savannah.gnu.org/bugs/?52053>

                 Summary: GUI becomes unresponsive when using slice() with
logical array
                 Project: GNU Octave
            Submitted by: gwiora
            Submitted on: Mon 18 Sep 2017 11:14:13 AM CEST
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: gwiora
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Microsoft Windows

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Details:

= Description =
When trying to slice a logical array the gui becomes unresponsive, at least
using qt on Windows.

= Example =
This example reproduces the behaviour:

[x,y,z]=meshgrid([1:5],[1:5],[1:5]);
vox = true(5,5,5);
vox(3,3,3)=false;
slice(x,y,z,vox,2,3,3)


Replacing the last line by

slice(x,y,z,double(vox),2,3,3)

produces the desired behavior.

=Suggested minimal solution=
Change documentation to state that logical arrays are not suitable.

=Better solution=
Allow use of logical arrays in slice.

=Background=
I found this problem, when using logical arrays in some other 3D-graphics
plotting functions too. Maybe it is a generic problem in some lower level
graphics function not cooperating with logical arrays.





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