I'm using python 2.7.14 with matplotlib 2.1.1 on Debian buster. I want to create a polar plot with an inverted radial axis. My values on radial axis are mostly negative and I want lower values ploted at higher radius, as they represent a better outcome, and vice versa. Additionally I want to set the coordinate origin to a defined value. However matplotlib seems to cause problems by defining the limits with the second parameter undergoing the first one. There exist some solutions (maybe a bit outdated) to this problems here and here. But is there an more elegant way to invert the axis? My code looks like this:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import matplotlib.pyplot as plt
import numpy as np
angle = [-90.,-45.,-30.,-20.,-13.,-9.,-6.,-4.,-2.,-1.,0.,1.,2.,4.,6.,9.,13.,20.,30.,45.,90.]
tresh = [-16.1,-16.,-13.8,-12.4,-10.7,-9.4,-8.,-6.7,-6.,-6.5,-6.4,-6.7,-6.5,-7.4,-7.6,-10.1,-12.4,-14.3,-15.5,-16.9,-17.4]
arc = np.deg2rad(angle)
fig = plt.figure()
ax = fig.add_subplot(111, polar=True)
ax.plot(arc,tresh)
ax.set_thetamin(-90)
ax.set_thetamax(90)
ax.set_theta_zero_location('N', offset=0)
ax.set_theta_direction(-1)
#ax.set_rorigin(-2)#This origin I want to set optionally.
ax.set_ylim(-18,-5)
#plt.show()
fig.savefig('test.png')
The following picture explains want I want to do.
Thank you for your help.
