Full_Name: Fred J. Version: 1.8.1 OS: windows 2000 Submission from: (NULL) (203.26.24.216) platform i386-pc-mingw32 the error can be duplicated as follows > rt <- data.frame(8:15, 7:14, 6:13, 5:12, 4:11, 3:10, 2:9, 1:8) > library(fdim) > FD <- (fdim(rt,q=2)) Error in slopeopt(AllPoints, Alpha) : Object "LineP" not found