After "from pylab import *", log(0.0) gives
Warning: Encountered divide by zero(s) in log
Where is this behaviour documented? What does it mean? Why should log(0.0) divide by zero? What does the plural "zeros" refer to? Why break the IEEE standard that log(0.0) should silently return -Inf?
PS: at http://matplotlib.sourceforge.net/pylab_commands.html, "it's size" should be "its size."