https://bugs.kde.org/show_bug.cgi?id=433982
Bug ID: 433982
Summary: Octave worksheet evaluation hangs on plot() function
Product: cantor
Version: 20.12.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: octave-backend
Assignee: cantor-b...@kde.org
Reporter: eg...@basealt.ru
Target Milestone: ---
SUMMARY
On the plot() function (and some other like: hist, bar, stem3, etc.) the
evaluation hangs.
STEPS TO REPRODUCE
1. Open cantor with octave backend
2. Write 'plot(1:1)'
3. Click 'Evaluate Worksheet'
OBSERVED RESULT
The program is responsible, but nothing is plotted.
The green '>>>' prompt is blinking.
At the bottom says 'Calculating...'.
EXPECTED RESULT
The plot result appears.
SOFTWARE/OS VERSIONS
Linux: Ubuntu 20.10
KDE Frameworks Version: 5.74.0
Qt Version: 5.14.2
Cantor Version: 20.08.2
Octave Version: 5.2.0
Also reproduces under:
Linux: Alt Linux Workstation K 9.1
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.12.9
Cantor Version: 20.12.3
Octave Version: 6.2.0
ADDITIONAL INFORMATION
Console output after "Evaluate Worksheet":
```
evaluate worksheet
login
starting ("/usr/bin/octave-cli", "--silent", "--interactive", "--persist",
"--eval", "PS1('CANTOR_OCTAVE_BACKEND_PROMPT:\\#> ');", "--eval",
"PS2('CANTOR_OCTAVE_BACKEND_SUBPROMPT:\\#> ');", "--eval", "addpath
\"/usr/share/cantor/octavebackend\";", "--eval",
"suppress_verbose_help_message(1);")
wsStatusChange 1
login done
evaluating: "if (length(available_graphics_toolkits()) > 0)\n
printf(\"%d\", 1);\nelse\n printf(\"%d\", 0);\nendif"
wsStatusChange 0
currentExpressionStatusChanged 1 "if (length(available_graphics_toolkits()) >
0)\n printf(\"%d\", 1);\nelse\n printf(\"%d\", 0);\nendif"
readOutput
start parsing "CANTOR_OCTAVE_BACKEND_PROMPT:1> "
readError
readOutput
start parsing "1CANTOR_OCTAVE_BACKEND_PROMPT:2> "
readError
parseOutput: "1"
setting result to a type 1 result
currentExpressionStatusChanged 2 "if (length(available_graphics_toolkits()) >
0)\n printf(\"%d\", 1);\nelse\n printf(\"%d\", 0);\nendif"
wsStatusChange 1
QString::arg: Argument missing: set (0, "defaultfigurevisible","off");,
evaluating: "set (0, \"defaultfigurevisible\",\"off\");"
wsStatusChange 0
currentExpressionStatusChanged 1 "set (0, \"defaultfigurevisible\",\"off\");"
evaluating: "plot(1:1)"
readOutput
start parsing "CANTOR_OCTAVE_BACKEND_PROMPT:3> "
readError
parseOutput: ""
currentExpressionStatusChanged 2 "set (0, \"defaultfigurevisible\",\"off\");"
currentExpressionStatusChanged 1 "plot(1:1)"
readOutput
start parsing "CANTOR_OCTAVE_BACKEND_PROMPT:4> "
readError
parseOutput: ""
```
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