Semilog plots with zero values #3998
Description
Consider the following test code:
from numpy import *
from matplotlib.pyplot import *
x = arange(-10,10)
y = (1.0 - 1.0/(x**2+1))**20
figure()
semilogy(x, y, "-o")
grid(True)
savefig("test.png")
Correct Plot (the value y=0 at x=0 is masked out from y-log plot):
Wrong Plot (spurious point at x=0 with y=1e-1):
A git bisect tells me that:
91725d8665975de9a26d631445ab1448b0391e1a is the first bad commit
commit 91725d8665975de9a26d631445ab1448b0391e1a
Author: Joel B. Mohler <[email protected]>
Date: Thu Aug 21 10:43:28 2014 -0400
use _fast_from_codes_and_verts in transform code
The commit diff introduces the use of _fast_from_codes_and_verts,
so the issue is probably somewhere deeper inside this function.