Settling y-axis scaling

Ok Figured out the solution but still have a problem.

    > There is a function get_ylim which gets you the ymin and
    > ymax values. I'm plotting multiple lines on the same axes
    > object. However the get_ylim returns different values
    > after each plot. I'm currently having to do it a numbe rof
    > times and reset my min and max values. Is there a way to
    > just do it once where it accounts for all lines plotted on
    > the axis?

How about calling the function only once after you have added all the
lines to your plot? Will this work for you?