[Matplotlib-users] New log plot problem

[Stephen W. <ste...@cs...>]

Hi, all,

Well, I've hit a new problem with the log plotting issue.  Try the 
following commands after 'ipython -pylab':

x=arange(25)+1
semilogx(x,x**2)
hold(False)
semilogx(x,x**2)

I get an apparently unbreakable chain of "Cannot take log of nonnegative 
value" messages for every following plot(), semilog(), or loglog() 
command until ipython is exited.  None of close(1), clf(), or cla() 
helps clear the problem.  Only creating a new figure with figure(2) and 
plotting to it seems to help.