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[Octave-bug-tracker] [bug #52608] quiver/quiver3 marker at the tail rath


From: anonymous
Subject: [Octave-bug-tracker] [bug #52608] quiver/quiver3 marker at the tail rather than at the head
Date: Wed, 6 Dec 2017 20:13:50 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0

URL:
  <http://savannah.gnu.org/bugs/?52608>

                 Summary: quiver/quiver3 marker at the tail rather than at the
head
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Thu 07 Dec 2017 01:13:48 AM UTC
                Category: Plotting
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: GNU/Linux

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Details:

If no marker is specified, then the arrows are at the head of the vectors. For
example,

quiver(1:2,3:4, -2:-1,1:2)
quiver(1:2,3:4, -2:-1,1:2, 'r')
quiver(1:2,3:4, -2:-1,1:2, 'b--')
quiver3(1:2,3:4,5:6, -2:-1,1:2,0:1)
quiver3(1:2,3:4,5:6, -2:-1,1:2,0:1, 'r')
quiver3(1:2,3:4,5:6, -2:-1,1:2,0:1, 'b--')


But if a marker is specified, then the markers are at the tail of the vectors.
For example,

quiver(1:2,3:4, -2:-1,1:2, 'r-v')
quiver(1:2,3:4, -2:-1,1:2, 'b--o')
quiver(1:2,3:4, -2:-1,1:2, 'b-o','filled')
quiver3(1:2,3:4,5:6, -2:-1,1:2,0:1, 'r-v')
quiver3(1:2,3:4,5:6, -2:-1,1:2,0:1, 'b--o')
quiver3(1:2,3:4,5:6, -2:-1,1:2,0:1, 'b-o','filled')



The docstring of quiver/quiver3 says that

The style to use for the plot can be defined with a line style
STYLE of the same format as the 'plot' command.  If a marker is
specified then markers at the grid points of the vectors are drawn
rather than arrows.  If the argument "filled" is given then the
markers are filled.


In this above paragraph, what does "the grid points of the vectors" mean? 
Does it mean the head or the tail of the vectors?





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