[Octave-bug-tracker] [bug #62081] quiver: arrowheads damage plot (to large)

[anonymous]

URL:
  <https://savannah.gnu.org/bugs/?62081>

                 Summary: quiver: arrowheads damage plot (to large) 
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Fri 18 Feb 2022 06:51:01 PM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: Manfred Quasten
        Originator Email: manfred.quasten@t-online.de
             Open/Closed: Open
                 Release: 5.2.0
         Discussion Lock: Any
        Operating System: Microsoft Windows

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Details:

plotting  a direction field of an ode the plot is damaged by the arrow head
when ordinate scale is smal. 

without line 14 (richtungsfeld.m)  the direction field from

z' = 1/0.00159979*sqrt(1+z^2)

is not useable. Switching the arrowheads off, it looks good.  The arrow heads
will damage it.  In this case it make no difference to skip it because z' is
monotonous increasing on R, and no information will be lost.  It have taken
some time to  found that the script works and that the size of the arrow heads
will be the problem. The size of the arrowheads should scale automaticly, the
default is too large and I was not able to resize it (MaxHeadSize property). 

 



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File Attachments:


-------------------------------------------------------
Date: Fri 18 Feb 2022 06:51:01 PM UTC  Name: richtungsfeld.m  Size: 618B   By:
None

<http://savannah.gnu.org/bugs/download.php?file_id=52883>
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Date: Fri 18 Feb 2022 06:51:01 PM UTC  Name: direction-field-modern-art.png 
Size: 75KiB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=52884>
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Date: Fri 18 Feb 2022 06:51:01 PM UTC  Name:
direction-field-without-arrowheads.png  Size: 41KiB   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=52885>
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Date: Fri 18 Feb 2022 06:51:01 PM UTC  Name: math.txt  Size: 560B   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=52886>

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