I am having trouble adding minor tick marks to an auto-scaled axis on a linear 
plot.  I hope someone can help.

I am drawing a plot where the X axis values are predictable, so I have the 
ability to define the desired major/minor intervals for tickmarks and 
gridlines.  The scale of the X axis is automatically defined by matplotlib.  I 
have manually specified the major and minor X axis tick/grid intervals using:

plt.grid(True, which='both')
XmajorLocator
XmajorFormatter
XminorLocator

My Y axis values are not predictable, so I rely on matplotlib to autoscale the 
Y axis, automatically defining the total range of values plotted and the major 
tickmark & gridline intervals.  I need more gridline resolution, so I would 
like to be able to add minor gridlines to the automatically scaled Y axis, but 
I'm having trouble doing it.

At present the autoscaled Y axis is only producing major ticks and major 
gridlines.  I'd like to add minor ticks and gridlines, but I have not been 
successful so far.  I'm hoping that someone can point out an obvious solution 
that I've just overlooked.  TIA. 


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