Allow Y axis to be reversed AND scaled based on X axis scale in -JX using the "-0" option
I just realized that using for example "-JX10c/-0" in psbasemap doesn't work if I want the Y axis to be scaled on the X axis and reversed.
Any idea how I can do that?
Yes, unfortunately "-JX10c/-0" does not work, since the user interface would not recognise the difference between 0 and -0, and besides, does not recognise a 0 scale as one that would follow the X axis.
The solution would be to use a relative size of your plot, that is, in centimeters per data unit.
Assuming that your plot is 10 units wide, you can use "-Jx1c/-1c" (note the lowercase "x").