[Octave-bug-tracker] [bug #48081] qt graphics toolkit plotting error: octave_base_value::convert_to_str_internal (): wrong type argument '<unknown type>'

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?48081>

                 Summary: qt graphics toolkit plotting error:
octave_base_value::convert_to_str_internal (): wrong type argument '<unknown
type>'
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Wed 01 Jun 2016 06:42:15 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: Lemmata
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.0.2
        Operating System: GNU/Linux

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Details:

When plotting using the qt graphics toolkit I occasionally get the following
error:


error: octave_base_value::convert_to_str_internal (): wrong type argument
'<unknown type>'
error: called from
    __line__ at line 117 column 21
    line at line 56 column 8
    __plt__>__plt2vv__ at line 500 column 10
    __plt__>__plt2__ at line 246 column 14
    __plt__ at line 113 column 17
    plot at line 222 column 10
    plot_string_error at line 29 column 5


The error is hit or miss, and so I've just been re-running my scripts to get
around it. Of course this is untenable for larger programs generating many
plots. My guess is that this is some threading error due to generating
multiple plots.

I've attached a script which frequently reproduces the error.



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File Attachments:


-------------------------------------------------------
Date: Wed 01 Jun 2016 06:42:15 PM UTC  Name: plot_string_error.m  Size: 1kB  
By: None
script for reproducing error
<http://savannah.gnu.org/bugs/download.php?file_id=37339>

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