Re: [R] Problem in NMDS

2010-01-20 Thread Gavin Simpson
On Wed, 2010-01-20 at 23:28 +0800, Bingzhang Chen wrote: > Hi, > > I am stuck in one problem when doing nonmetric multidimensional > scaling. I use the function 'metaMDS' in the package 'vegan' to work > on the presence/absence community data. The problem is when two > samples are identical (dissi

[R] Problem in NMDS

2010-01-20 Thread Bingzhang Chen
Hi, I am stuck in one problem when doing nonmetric multidimensional scaling. I use the function 'metaMDS' in the package 'vegan' to work on the presence/absence community data. The problem is when two samples are identical (dissimilarity = 0), metaMDS cannot work with zero dissimilarity. I don