On 10/26/2009 11:05 AM, hadley wickham wrote:
What are the values of
length((Ht_cm[type=='SD'][from_treeline=='above'])[1])
I suspect the error is in the subsetting - the following seems more plausible:
Ht_cm[type=='SD' && from_treeline=='above']
But don't double that ampersand: use
Ht_cm[type=='SD' & from_treeline=='above']
Duncan
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