I have been trying to generate a heatmap plotted on a semicircle. The csv file I have has three columns. column 1 is Temperature, column 2 is angle and column 3 is occurrence.
| Temperature | phiangle | Counts |
|---|---|---|
| 25 | 0.71 | 4347 |
| 25 | 3.53 | 3149 |
| 25 | 4.94 | 2100 |
| 25 | 6.35 | 1731 |
| 25 | 7.76 | 1405 |
| .... | .... | .... |
| 249 | 172.94 | 3687 |
| 249 | 174.35 | 6592 |
| 249 | 175.76 | 12866 |
| 249 | 177.18 | 25725 |
| 249 | 180.00 | 23464 |
I have about 40K rows with temperature ranging from 25 to 249.
Now I would like the colorbar to show Counts (which is column 3). I would like the phiangle (column 2 which changes only from 0 to 180) on a semi circle. And temperature (column 1) to increase radially from the centre of the sphere.
Here is my code which does not work.
import pandas as pd
import matplotlib.pyplot as plt
import numpy as np
scsv = pd.read_csv('polarchartdata.csv', sep=";")
x = scsv['Temperature'].values
y = scsv['phiangle'].values
yrad = np.radians(y)
z = scsv['Counts'].values
print(scsv)
print(x,y,z)
fig, axes = plt.subplots(subplot_kw=dict(projection='polar'))
contourplot = axes.contourf(x, y, z)
axes.set_thetamin(0)
axes.set_thetamax(180)
plt.colorbar(contourplot, shrink=.6, pad=0.08)
plt.show()
I would want something similar with temperature going from the centre of the semicircle and outward.
[![enter image description here][1]][1]
Of course I would want to add a colorbar denoting the values in column 3.
When I Run this, I get a TypeError: Input z must be 2D, not 1D [1]: https://i.stack.imgur.com/EIM8v.png
