[Octave-bug-tracker] [bug #45167] Spy with gnuplot: wrong axis orientation (upside down) with gnuplot 5

[Dan Sebald]

Follow-up Comment #2, bug #45167 (project octave):

>From the gnuplot help:


 The `reverse` option reverses the direction of an autoscaled axis. For
example,
 if the data values range from 10 to 100, it will autoscale to the equivalent
of
 set xrange [100:10].  The `reverse` flag has no effect if the axis is not
 autoscaled. NB: This is a change introduced in version 4.7.


The new syntax is to simply place the limits in opposite order.  So I
replaced


set xrange [0.000000000000000e+00:4.000000000000000e+00] noreverse;
set yrange [0.000000000000000e+00:4.000000000000000e+00] reverse;


with


set xrange [0.000000000000000e+00:4.000000000000000e+00];
set yrange [4.000000000000000e+00:0.000000000000000e+00];


and obtained the proper plot.

I set about fixing this then discovered I already made a changeset, attached
here:

https://savannah.gnu.org/bugs/?38914

BTW, just curious if you think the axes would look better for this plot if the
x-axis were at the top of the plot rather than at the bottom.  If I were to
illustrate the indices of a matrix, I think that's how I would do it:


  1  2  3  4  5  6 ...
1

2

3

4

...


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