[FIXED] Issues with clockwise polar plot

Issue

I have a list of values representing radius (r) and another representing angles (theta). I am trying to make a polar plot with North as 0 deg, East as 90 deg and so on.

import matplotlib.pyplot as plt 
import numpy as np

theta = [87.23008557164445, 100.26076015446364, 78.71990232378403, 136.34914122677247, 103.6118957767244, 108.8898592700267, 93.2079887669754]

r = [9.672704455052727, 5.747648969819628, 7.8846103848102835, 3.924182947507153, 5.631744483153131, 7.051601437489786, 2.2619972761713196]

colors = ['#c96253', '#e6b065', '#59c752', '#52c7bb', '#5260c7', 'w', 'k']

fig, ax = plt.subplots(subplot_kw={'projection': 'polar'})
ax.set_theta_direction(-1)
ax.set_theta_zero_location('N')

for i in range(0, len(r)):
    ax.vlines(theta[i], 0, r[i], colors=colors[i], zorder=3)

The angles in the list does not correspond to what is plotted. Does anyone know how to solve it?

Solution

You need to put the theta parameter in radians. You can use math.radians() to do this.

import matplotlib.pyplot as plt 
import numpy as np
import math

theta = [87.23008557164445, 100.26076015446364, 78.71990232378403, 136.34914122677247, 103.6118957767244, 108.8898592700267, 93.2079887669754]

r = [9.672704455052727, 5.747648969819628, 7.8846103848102835, 3.924182947507153, 5.631744483153131, 7.051601437489786, 2.2619972761713196]

colors = ['#c96253', '#e6b065', '#59c752', '#52c7bb', '#5260c7', 'w', 'k']

fig, ax = plt.subplots(subplot_kw={'projection': 'polar'})
ax.set_theta_direction(-1)
ax.set_theta_zero_location('N')

for i in range(0, len(r)):
    ax.vlines(math.radians(theta[i]), 0, r[i], colors=colors[i], zorder=3)

Output

Answered By - Nick ODell