[R] isoMDS error message!!!

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Subject: [R] isoMDS error message!!!
From: Andrea Rossetti (rossetti@markov.stat.unipg.it)
Date: Wed 01 Mar 2000 - 02:03:51 EST 

Message-ID: <Pine.GSO.4.05.10002291701220.4374-100000@markov.stat.unipg.it>

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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