[R] Stacked plots with common x-axis and different y-axis

[Jim Lemon]

Jason Rupert wrote:
> Is there a place that shows how to create two plots that are stacked on top of each other where they share a common x-axis scale, but have differnt y-axis scale?
>
> Say have the following data: airquality
> Stack plot(airquality$Day, airquality$Wind) on top of  plot(airquality$Day, airquality$Temp). 
>
> I am interested in stacking the two on top of each other with no seam, or plotting the two lines with two different y-axis scales on the same plot.  
>   
Hi Jason,
Have a look at twoord.plot in the plotrix package.

Jim