I want to get rid of them.  I am pretty sure I'm not dividing by zero
anywhere; 1/sqrt(f**2+1) really shouldn't ever be zero here.  Any
ideas?

y = var('y')
g = 1
P=plot_slope_field(g,(x,3,4),(y,-1,1))
P
<two sets of warnings>

And when I say "get rid of", I mean by tomorrow morning in a talk I'm
giving.  This is almost certainly due to the recent numpy upgrades
being pickier, based on the little searching I did.  I'm not turning
off warnings in numpy, though, since we use it under the hood only
here.

Thanks,
- kcrisman

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