bugGNU Octave - Bugs: bug #44502, zoom.m docs for 3D plots incorrect?


bug #44502: zoom.m docs for 3D plots incorrect?

Submitter:  Philip Nienhuis <philipnienhuis>
Submitted:  Tue 10 Mar 2015 08:37:32 PM UTC
Category:  Plotting Severity:  3 - Normal
Priority:  5 - Normal Item Group:  None
Status:  Confirmed Assigned to:  None
Originator Name:  Philip Nienhuis Open/Closed:  * Open
Release:  * dev Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Fri 23 Dec 2016 09:14:00 PM UTC, comment #4: 

This issue is still the same in Octave 4.2.0.

Hartmut <hardy>
Thu 12 Mar 2015 09:39:21 PM UTC, comment #3: 

Seems like the reasonable solution to me.  Octave will be a superset of Matlab supporting xon and yon, but also zon.  Nobody porting their code in the direction of Matlab -> Octave will have a problem.

Rik <rik5>
Group administrator
Thu 12 Mar 2015 09:28:59 PM UTC, comment #2: 

Yeah, when I first wrote zoom, I think it did zoom on the three axes.  But then when I tried to move in the direction of compatibility with the zoom object thing that Matlab has, and the zoom xon, zoom yon feature, I punted because it wasn't clear to me how to handle that.  Matlab doesn't have zoom zon, or zoom xyon or zoom xyzon, etc.  Should we allow those modes to be selected?  Likewise for the pan function.

John W. Eaton <jwe>
Group administrator
Thu 12 Mar 2015 09:18:18 PM UTC, comment #1: 


I think it would be nice to fig bug #44323 by sizing the Z axis at the same time that the X and Y axes are changed.  If that approach is adopted then I think it makes sense to expand zoom.m to cover the case of a third input for zoom.

Rik <rik5>
Group administrator
Tue 10 Mar 2015 08:37:32 PM UTC, original submission:  

help zoom gives:

Given a numeric argument greater than zero, zoom by the given
factor.  If the zoom factor is greater than one, zoom in on the
plot.  If the factor is less than one, zoom out.  If the zoom
factor is a two- or three-element vector, then the elements
specify the zoom factors for the x, y, and z axes respectively.

Trying to set zoom factor for x & y, then x,y & z-axes:

>> zoom ([2 2])   # OK
>> zoom ([2 2 2])
error: zoom: invalid factor
error: called from
    zoom at line 107 column 11

The switch statement in zoom.m starting on L.101 clearly has no provisions for zoom factors in 3D, unlike the texinfo docs state.

(I hit this when investigating bug #44323 to check if I had overlooked the obvious)

Philip Nienhuis <philipnienhuis>
Group Member


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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-03-12 rik5 StatusNone Confirmed

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