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?

Keith

PS: at http://matplotlib.sourceforge.net/pylab_commands.html, "it's size" should be "its size."