3 functions on same plot

I'd give the same xlim=c(-a,b) and ylim=(-c,d) parameters to these three
functions and then, after each function call 

par(new=T)

Use par(xaxs="d", yaxs="d") is a better way to `lock' the scales (and you 
should omit the axes and annotations on subsequent plots).

But maybe someone has got a better solution.

?matplot

However, my understanding is that those three functions are unlikely to 
share a common scale (likelihood being different from the other two) so
either two scales will be needed or the likelihood would need to rescaled.

From: Joachim Brouwers [mailto:joachim.brouwers at gmx.net]

How can i plot 3 functions (prior, likelihood and posterior) on the same
plot?

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595