From: Ryan Krauss <ryanlists@gm...>  20060213 23:32:27

I am having a weird problem zooming in on a graph using ylim(ymin,ymax). The data is all positive. I am trying to search for local minimums of a function of one variable. So, I evaluate the function over a vector and look graphically for local minimums to use as initial guesses to scipy.optimize.fmin. If I plot all of the data, it looks like the attached file zoomout.png. But if I try and zoom in using ylim, I get the rather strange looking plot in zoomin.png. Some of the data is negative on the plot even though min(yvector)=3D=3D0.0. I can sort of fixe the problem using masked arrays (zoommasked.png), but I would like to have vertical lines going up to the masked values  like would be there if I could just zoom in correctly. I am using matplotlib cvs from some time last week, scipy 0.4.5.1579, and numpy 0.9.5.2043 and numerix=3Dnumpy. What am I going wrong or is this a bug? Thanks, Ryan 