expression(theta^{"+"}) expression(theta^{"-"}) expression({theta^{"+"}}(mu)}) etc., work fine (once I actually *thought* about what the problem was) Ben B. Benjamin Bolker Dep't of Ecology and Evolutionary Biology, ben@eno.princeton.edu Princeton University tel: (609) 258-6886, fax: (609) 258-1334 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._