Thank-you Petr. I have consulted as many manuals and help pages, and search engines, and trying various things in SIAR, but continuous errors prevail..
I have tried changing all matrices to numeric, but the first column , of the two latter matrices, returns as NA. Any other suggestions? I had put in one of these messages more detail about data, see below. pond <- c("A3", "A3", "A3", "B3", "B3", "B3","C2", "A7", "A7") d13C <- c(-22.07, -20.39, -21.11...) d15N <- c(16.06, 17.13, 16.7, ...) FConsumerData <- data.frame(pond, d13C, d15N) FTEFData <- data.frame(tefsources, tefMeand13C, tefSDd13C, tefMeand15N, tefSDd15N) sources <- c("Copepoda", "Algal Paste", "Amphipoda", Meand13C <- c(-26.57, -20.41, -21.65,... SDd13C <- c(1.78, 4.01, 1.46,... Meand15N <- c(15.55, 9.58, 14.07... SDd15N <- c(1.77, 1.34, 1.66,... FSourceData <- data.frame(sources, Meand13C, SDd13C, Meand15N, SDd15N) tefsources <- c("Copepoda", "Algal Paste", "Amphipoda",... tefMeand13C <- c(0.4, 0.4, 0.4,... tefSDd13C <- c(1.3, 1.3, 1.3, tefMeand15N <- c(3.4, 3.4, 3.4, tefSDd15N <- c(1.0, 1.0, 1.0, Hope that helps explain? ?? -- View this message in context: http://r.789695.n4.nabble.com/Error-in-matrix-not-ordered-vectors-or-numerical-value-and-SIAR-tp4024578p4030650.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.