foo.pdf : foo.tex 
	pdflatex foo.tex ; pdflatex foo.tex
	
foo.tex : foo.Rnw
	R CMD Sweave foo.Rnw 

foo.R : foo.Rnw
	R CMD Stangle foo.Rnw 

clean : 
	rm -rf *.eps *.pdf *.tex *.log *.aux