R help - Oct 2012 - In is.euclid(m2) : Zero distance(s)

Dear useRs,i am applying "mantel test" to find the correlation between
distance matrices, by ade4 package. some of the correlations, although given me
r-values, have shown following warning message..
"In is.euclid(m2) : Zero distance(s)"
i wanted to know that why has this message prompted? although i have got the
result but still is it of concern?thanks in advance
regardseliza 


 		 	   		  
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