Fill area under curve in matlibplot python on log scale

Question

I'm trying to fill the area under a curve with matplotlib. The script below works fine.

import matplotlib.pyplot as plt
from math import sqrt
x = range(100)
y = [sqrt(i) for i in x]
plt.plot(x,y,color='k',lw=2)
plt.fill_between(x,y,0,color='0.8')
plt.show()

However if I set the y-scale to logarithmic (see below). It sometimes fills the area above the curve ! Can anyone help me? I would like to fill the area between the curve and y = 0.

x = range(100)
y = [sqrt(i) for i in x]
plt.plot(x,y,color='k',lw=2)
plt.fill_between(x,y,0,color='0.8')
plt.yscale('log')
plt.show()

Thanks in advance!

Answer 1

With a logarithmic y-scale, fill_between(x, y, 0) tells matplotlib to fill the region between log(0) = -infinity and log(y). Naturally, it balks. You can avoid the problem by changing 0 to some small number like 1e-6.