Bug 190481 - zplane() fails
zplane() fails
Product: Fedora
Classification: Fedora
Component: octave (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Quentin Spencer
Fedora Extras Quality Assurance
Depends On:
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Reported: 2006-05-02 15:52 EDT by Piergiorgio Sartor
Modified: 2007-11-30 17:11 EST (History)
1 user (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2006-05-04 10:18:35 EDT
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Description Piergiorgio Sartor 2006-05-02 15:52:26 EDT
Description of problem:
zplane() function fails due to change in hold() function.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
Start octave and generate some filter, for example:


Then plot the zeros/poles graph with:


Actual results:
An incomplete zeros/poles plot with the following error:

usage: hold ("on") or hold ("off")
error: evaluating if command near line 59, column 3
error: called from `hold' in file `/usr/share/octave/2.9.5/m/plot/hold.m'
usage: hold ("on") or hold ("off")
error: evaluating if command near line 59, column 3
error: called from `hold' in file `/usr/share/octave/2.9.5/m/plot/hold.m'
error: called from `zplane' in file

Expected results:
Complete and correct zeros/poles plot without errors.

Additional info:
This creates also an other problem: succesive plots inherit some bad
configuration and they are basically broken, usually shrinked horizontally
to an unreadable size.
This seems hard to reset (I could only do it exiting octave and restarting).

Looking at the error reported and the script zplane.m, it is clear that
"hold" is not called in the correct way.
Replacing "hold on" with "hold("on")" (same for "off") fixes the problem.
Note that from command line "hold on" does not return errors, which is
maybe a second bug.
Comment 1 Quentin Spencer 2006-05-04 10:18:35 EDT
The problem with hold on has been fixed with a patch to octave. It only happened
when "hold on" was followed by a semicolon and a end-of-line comment, and
preceeded by certain commands. The problem with plot settings has been fixed by
patching the zplane function (which by the way is actually in octave-forge,
rather than octave).

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