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[Octave-bug-tracker] [bug #55983] 'x(ix) = []' deletion syntax does not

From: Andrew Janke
Subject: [Octave-bug-tracker] [bug #55983] 'x(ix) = []' deletion syntax does not work for objects
Date: Fri, 22 Mar 2019 19:38:39 -0400 (EDT)
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.75 Safari/537.36


                 Summary: 'x(ix) = []' deletion syntax does not work for
                 Project: GNU Octave
            Submitted by: apjanke
            Submitted on: Fri 22 Mar 2019 11:38:37 PM UTC
                Category: Interpreter
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 5.1.0
        Operating System: Any



The special 'x(ix) = []' syntax is supposed to remove identified elements from
the array x, regardless of x's type. That is, [] may be a double, but it
doesn't matter whether x's type is assignment-compatible with double for this
special calling form.

This doesn't work for classdef objects. For example:

octave:1> addpath('~/local/repos/octave-packajoozle/inst')
octave:2> pkg = packajoozle.internal.PkgVer ('financial', '0.5.3')
pkg =
financial 0.5.3

octave:3> p = pkg;
octave:4> p(2) = pkg;
octave:5> p(3) = pkg
p =
financial 0.5.3; financial 0.5.3; financial 0.5.3

octave:6> p(2) = []
error: cannot convert `null_matrix' into `object'


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