I am at my wit's end. I am not sure what is wrong with this data matrix. It is sparse because it is a matrix of species, but I have looked at the row totals and column totals and they are positive. metaMDS(x.d) Error in if (autotransform && xam > 50) { : missing value where TRUE/FALSE needed What is wrong? And in the future how in God's name do I easily diagnose whatever problem there is with this data. I am in debt to anyone who figures this one out. Thanks Stephen -- Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: trans.txt Url: https://stat.ethz.ch/pipermail/r-help/attachments/20080422/ccc3de62/attachment.txt