[R] isoMDS error message!!!

[Andrea Rossetti]

Hi to all,

I do this

> valumod<-read.table("valu-medie.txt",header=T)
> library(mass)
> library(mva)
> valumod.x <- as.matrix(valumod)
> valumod.dist<-dist(valumod.x)
> valumod.mds <- isoMDS(valumod.dist)
Error in isoMDS(valumod.dist) : zero or negative distance between objects 2 and 4
>

Where is the error?

Andrea Rossetti.

PS I've attached the dataset.


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