R help - Mar 2004 - newbie question on clustering performance

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> May I ask you some questions on clustering analysis?
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> How do I get jacard score from cluster object?
>  or after I call kmanes or pam function how do I know which number of 
> clusters
> sounds the best.
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> Another question on heatmap, if you do not mind, how do I retrive the 
> name of
> rows when some area is hot.
>
> Thanks in adavance,
>
> Xin Gong
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