Runtime Error: No positive data to plot

I have been using matplotlib a few days now and think I it is

    > great but recently I have gotten hung up on a problem
    > plotting negative numbers.

    > I am trying to plot data where the y values are all negative.
    > When I do this I get the No positive data to plot error. I
    > have tracked it down to the following two line is

    > /matplotlib/ if minpos<=0: raise RuntimeError('No
    > positive data to plot')

This should only be occurring if you have log scaling set. Could you
get a fresh copy of matplotlib CVS and see if you can replicate the
bug. And if so, please post a script that exposes it.