Dear All I am trying to do a partial canonical analysis of principal coordinates using Bray-Curtis distances. The capscale addin to R appears to be the only way of doing it, however, when I try and calculate a Bray-Curtis distance matrix either using Capscale or Vegedist (capscale I understand uses Vegedist anyway to calculate its distance matrix), R uses up all available memory on the computer, stops and then comes back with errors regarding negative eigenvalues. I must admit to being a very very basic R user so this is starting to go over my head. I tried using the distpcoa program of Legendre and Anderson that can supposedly output a Bray-Curtis distance matrix corrected for the problem of negative eigenvalues (i.e., trying to circumvent the first steps in Capscale) but have had no success as my datamatrix is larger than what their program can handle. Just wondering if anyone can suggest a way of sorting what I am finding to be a tricky little problem. look forward to peoples thoughts. Regards Steve Pawson PhD Student School of Biological Sciences & School of Forestry, University of Canterbury Address: Forest Research Institute P.O. Box 29237 Fendalton Christchurch Ph 03 3642949 Ext 7831 -------------------------------------------------------------------------------------------- This email is confidential and may be legally privileged. If received in error please destroy and immediately notify us. ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
