bugGNU Octave - Bugs: bug #56006, Object indexing:...


bug #56006: Object indexing: obj(1).property(end+1:n) - end is interpreted wrong

Submitted by:  Andrew Janke <apjanke>
Submitted on:  Wed 27 Mar 2019 02:21:41 AM UTC  
Category:  Interpreter Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  None Assigned to:  None
Originator Name:  Open/Closed:  Open
Release:  dev Operating System:  Mac OS

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Wed 27 Mar 2019 02:21:41 AM UTC, original submission:  

I'm running into a weird indexing issue.

Let's say I have a class Version, that represents software versions.

classdef Version
    elements = [0]
    function this = Version (elements)
      if nargin == 0
      this.elements = elements;
    function disp (this)
      fprintf ("Version: %s\n", mat2str(this.elements));

I have a 3-element Version that I want to pad out with zeros to be six elements. If it is a scalar Version object and I address it as such, this works fine.

octave:16> v = Version([3 3 3])
v =
Version: [3 3 3]

octave:17> v.elements(end+1:6) = 0
v =
Version: [3 3 3 0 0 0]

But if I have an array of Version objects and I index them individually before addressing their property, the wrong elements get overwritten.

octave:19> v = Version([3 3 3])
v =
Version: [3 3 3]

octave:20> v(1).elements(end+1:6) = 0
v =
Version: [3 0 0 0 0 0]


It seems like in this case, the `end` is being interpreted with respect to the size of v or v(1), not the size of v(1).elements (which I think it should be).

Happens in 4.4.1, 5.1.0, and default.

Andrew Janke <apjanke>


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