[R] fill a dataframe with zeros where the rows are a smaller subset of a larger dataframe (species by site)

[Stephen Sefick]

I am subsetting a larger data frame that contains macroinverterate 
taxa.  I am subsetting them at different levels of taxonomic 
resolution.  Some of the sites do not have say Tipulidae present, so the 
rows are removed completely for this site.  I would like to fill in the 
sites that were removed during the subsetting and fill these with 0.  I 
have the non-subsetted dataframe which contains all of the sites.  I 
would like to use the sites from this complete data set to "expand" the 
dataframe that is a subset of the sites in the original.  Is that more 
clear.

Stephen

On Wed 25 Apr 2012 09:13:24 AM CDT, chuck.01 wrote:
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