[Octave-bug-tracker] [bug #45167] Spy with gnuplot: wrong axis orientation (upside down)

[Francois-Henry Rouet]

URL:
  <http://savannah.gnu.org/bugs/?45167>

                 Summary: Spy with gnuplot: wrong axis orientation (upside
down)
                 Project: GNU Octave
            Submitted by: fhrouet
            Submitted on: Fri 22 May 2015 07:29:52 PM GMT
                Category: Plotting with gnuplot
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.2
        Operating System: GNU/Linux

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Details:

OS: Arch Linux
Octave version: 3.8.1
gnuplot version: 5.0.0

"Spy" with gnuplot shows the matrix upside-down (last row on top, first row at
bottom). The problem doesn't show up with fltk. It seems to be due to the
interaction with gnuplot. With gnuplot version 4.6.6, the plot is correct.

Example:

octave:1> A=sparse(tril(ones(3,3)))
A =

Compressed Column Sparse (rows = 3, cols = 3, nnz = 6 [67%])

  (1, 1) ->  1
  (2, 1) ->  1
  (3, 1) ->  1
  (2, 2) ->  1
  (3, 2) ->  1
  (3, 3) ->  1

octave:2> full(A)
ans =

   1   0   0
   1   1   0
   1   1   1

octave:3> spy(A)
[shows the following:
   *  *  *
   *  *
   *
cf. screenshot]



 




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