Register to reply 
Python, matplotlib plot 2D histogram on polar axis. 
Share this thread: 
#1
Nov2112, 12:12 PM

P: 36

Any python/matplotlib experts out there?? This one has been driving me crazy all day. I have three vectors, azimuth, frequency and power, which I would like to histogram and plot on a polar axis. I can plot a scatter plot this way no problem but the histogram gets messed up somehow. An example is below, anybody know how to do this properly??
import random import numpy as np import matplotlib.pyplot as plt baz = np.zeros((20)) freq = np.zeros((20)) pwr = np.zeros((20)) for x in range(20): baz[x] = random.randint(20,25)*10 freq[x] = random.randint(1,10)*10 pwr[x] = random.randint(10,1)*10 baz = baz*np.pi/180. abins = np.linspace(0,2*np.pi,360) sbins = np.linspace(1, 100) H, xedges, yedges = np.histogram2d(baz, freq, bins=(abins,sbins), weights=pwr) plt.figure(figsize=(14,14)) plt.subplot(111, polar=True) #plt.scatter(baz, freq, c=pwr) plt.pcolormesh(H) plt.show() 


#2
Nov2112, 02:10 PM

P: 872

I don't follow...what is it that you are trying to achieve? Can you show a picture? If I uncomment the scatter plot and comment out the colormesh, I do see a nice picture...it is just that colormesh covers the entire place....are you sure you want colormesh? or some other function? how about bar?



#3
Nov2112, 03:57 PM

P: 36

Hi,
I've attached a link to a picture showing what I need, and I did try bar but couldnt get that to work properly either. 


#4
Nov2112, 08:43 PM

P: 872

Python, matplotlib plot 2D histogram on polar axis.
Hhhhhmmm....maybe you just need to play around with the parameters of the mesh, you know, the colormap and which color correspond to which range...you should inspect the data you are plotting, maybe is too one sided or something



#5
Nov2212, 08:43 AM

P: 36

solution here :)



Register to reply 
Related Discussions  
Best way to achieve a plot of polar coordinate points for CIE L*C*H* colour system  Math & Science Software  0  
Plotting CfA1 and CfA2 in polar coordinates using Python  Astronomy & Astrophysics  0  
Plot Polar Vector field  Math & Science Software  0  
Labelling the axis on a Maple plot  Math & Science Software  0  
Polar axis?  General Math  1 