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Avoid triggering warnings in mandelbrot example. #13226

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Jan 19, 2019
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Avoid triggering warnings in mandelbrot example. #13226

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12 changes: 5 additions & 7 deletions examples/showcase/mandelbrot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -33,11 +33,11 @@ def mandelbrot_set(xmin, xmax, ymin, ymax, xn, yn, maxiter, horizon=2.0):
from matplotlib import colors
import matplotlib.pyplot as plt

xmin, xmax, xn = -2.25, +0.75, 3000/2
ymin, ymax, yn = -1.25, +1.25, 2500/2
xmin, xmax, xn = -2.25, +0.75, 3000 // 2
ymin, ymax, yn = -1.25, +1.25, 2500 // 2
maxiter = 200
horizon = 2.0 ** 40
log_horizon = np.log(np.log(horizon))/np.log(2)
log_horizon = np.log2(np.log(horizon))
Z, N = mandelbrot_set(xmin, xmax, ymin, ymax, xn, yn, maxiter, horizon)

# Normalized recount as explained in:
Expand All @@ -47,15 +47,13 @@ def mandelbrot_set(xmin, xmax, ymin, ymax, xn, yn, maxiter, horizon=2.0):
# This line will generate warnings for null values but it is faster to
# process them afterwards using the nan_to_num
with np.errstate(invalid='ignore'):
M = np.nan_to_num(N + 1 -
np.log(np.log(abs(Z)))/np.log(2) +
log_horizon)
M = np.nan_to_num(N + 1 - np.log2(np.log(abs(Z))) + log_horizon)

dpi = 72
width = 10
height = 10*yn/xn
fig = plt.figure(figsize=(width, height), dpi=dpi)
ax = fig.add_axes([0.0, 0.0, 1.0, 1.0], frameon=False, aspect=1)
ax = fig.add_axes([0, 0, 1, 1], frameon=False, aspect=1)

# Shaded rendering
light = colors.LightSource(azdeg=315, altdeg=10)
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