[BioC] superimpose lowess on smoothScatter

[Kasper Daniel Hansen]

> I am trying to create an MvA plot using smoothScatter that has a lowess
> curve fit superimposed.  I can't seem to find documentation on
> smoothScatter
> that will allow this.  Currently I have:
>
> smoothScatter(x,y, main = "My MvA Plot")

Here I assume that you have already compute the MA transformation, so
that x is your A values and M is your y values

smoothScatter(x,y)
lines(lowess(x,y))

Kasper