[Matplotlib-users] One legend, two axes?

[Skip M. <sk...@po...>]

I am plotting a time series, a handful of moving averages and the
standard deviation of one of the moving averages.  The first crop of
data are all in an overlapping range so are plotted using the
left-hand y axis.  The standard deviation range falls way outside the
ranges of the other data streams, so I plot it on the right- hand
axis.

Since legends are associated with an axis how do I create one legend
which covers all lines in the graph?  I keep getting a complaint from
mpl about the number of labels not matching the number of arrays being
plotted (one v. five if I get the legend associated with the
right-hand axis, four v. five if I get the legend associated with the
left-hand axis).

Thanks,

Skip Montanaro
sk...@po...