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POHow to use log scale on polar axis in matplotlib
 

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  1. POHow to use log scale on polar axis in matplotlib
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    <p>I am trying to create a polar plot with a log scale on the radial axis but I keep getting an error. Some example code and the error are below. It seems to work fine in Cartesian coordinates, does anyone know what's happening??</p> <pre><code>import matplotlib.pyplot as plt import numpy as np import matplotlib.cm as cm bazbins = np.linspace(0, 2*np.pi, 360) fbins = np.logspace(np.log10(0.05), np.log10(0.5), 101) theta, r = np.meshgrid(bazbins, fbins) # Set up plot window fig, ax = plt.subplots(figsize=(12,9))#, subplot_kw=dict(projection='polar')) # polar ax.set_theta_zero_location('N') ax.set_theta_direction(-1) ax.set_rscale('log') # carthesia #ax.set_yscale('log') # Plot data #ax.pcolormesh(theta, r, r) plt.gca().invert_yaxis() ax.contourf(theta, r, r) ax.set_ylim((0.0, 0.5)) plt.show() </code></pre> <p>Exception in Tkinter callback:</p> <pre><code>Traceback (most recent call last): File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1413, in __call__ return self.func(*args) File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 236, in resize self.show() File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py", line 239, in draw FigureCanvasAgg.draw(self) File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_agg.py", line 421, in draw self.figure.draw(self.renderer) File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/lib/pymodules/python2.7/matplotlib/figure.py", line 898, in draw func(*args) File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 1997, in draw a.draw(renderer) File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/lib/pymodules/python2.7/matplotlib/axis.py", line 1045, in draw tick.draw(renderer) File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/lib/pymodules/python2.7/matplotlib/axis.py", line 239, in draw self.label1.draw(renderer) File "/usr/lib/pymodules/python2.7/matplotlib/artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "/usr/lib/pymodules/python2.7/matplotlib/text.py", line 591, in draw ismath=ismath) File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_agg.py", line 156, in draw_text return self.draw_mathtext(gc, x, y, s, prop, angle) File "/usr/lib/pymodules/python2.7/matplotlib/backends/backend_agg.py", line 145, in draw_mathtext x = int(x) + ox ValueError: cannot convert float NaN to integer </code></pre>
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    1. COTry setting rscale (which is basically yscale) after `set_ylim()`
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