[R] plot y1 and y2 on one graph

[hadley wickham]

>  Now I would like to plot y1 and y2 on the same graph, with its two scales
>  (y1 on left and y2 on rigth side).

Before you actually do that, you might want to think about if it's a
good idea or not.  Are you trying to deliberately mislead or confuse
your readers? If so, it's a good idea, otherwise it's probably not.

You might want to read this "blast from the past":
K. W. Haemer. Double scales are dangerous. The American Statistician,
2(3):24–24, 1948.

Hadley

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