keunhchoi at gmail.com: > p0<- c(f=0.87, b=0.1, c=150) > f<-p[1]; b<-p[2]; c<-p[3] Do *not* redefine the meaning of the function c() to 150, or to p[3]. If you do, very few things in R will continue to work properly! -- Karl Ove Hufthammer