[R-sig-eco] NMDS in vegan

[Manuel Spínola]

Dear list,

I am trying to run a NMDS in vegan.  I am using standardized variables, 
so I have negative values.  This is my output:

 > metricas =read.table("metricas_std.txt", header=TRUE)
 > attach(metricas)

        The following object(s) are masked from metricas ( position 3 ) :

         LPI MNN MSI NUMP

 > metricas
      NUMP   LPI   MSI   MNN
1945 -1.72  0.10 -1.20 -1.03
1960  0.83  0.62 -0.90 -1.13
1980  0.55  1.27  0.12  0.45
1997  0.09 -1.00  0.90  0.97
2005  0.24 -1.00  0.72  0.72
 > metricas.dis <- vegdist(metricas, "euclidean")
 > metricas.dis
          1945      1960      1980      1997
1960 2.6216216                             
1980 3.2333574 2.0094029                   
1997 3.5911140 3.2896808 2.4986596         
2005 3.4351856 3.0032316 2.3836736 0.3426368
 > metamds = metaMDS(metricas, distance="euclidean")
Using step-across dissimilarities:
Too long or NA distances: 9 out of 10 (90.0%)
Stepping across 10 dissimilarities...
Error in isoMDS(dist, k = k, trace = isotrace) :
  an initial configuration must be supplied with NA/Infs in 'd'
In addition: Warning message:
In stepacross(dis, trace = trace, ...) :
  Disconnected data: Result will contain NAs

Do you know what is going on?
Thank you very much in advance.
Best,

Manuel Spínola

-- 
Manuel Spínola, Ph.D.
Instituto Internacional en Conservación y Manejo de Vida Silvestre
Universidad Nacional
Apartado 1350-3000
Heredia
COSTA RICA
mspinola at una.ac.cr
Teléfono: 277-3598
Fax: 237-7036