[R] Overlay two plots on the same device with axes having the same scale.

[Ben Bolker]

John Sorkin <jsorkin <at> grecc.umaryland.edu> writes:

> I have crated a file containing data with x and y 
> values and have plotted the data using the output of gam. I
> would like to overlay an x,y plot of the data on top of
> the line returned by gam. 

   Why not plot the gam fit first and then use points(x,y) to
add the original data to the plot?

  Ben Bolker