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2010 Jul 26
1
Repeated Procedures
...nds,
Using package Vegan, I need to calculate Shannons Diversity index
and Pielou's Evenness for a set of 20 study areas. Each area is
represented by a matrix of 25 sample plots x tree species. The code is
as following, where data stands for the data matrix of any of the 20
areas:
S <- specnumber(data)
H <- diversity(data)
J <- H/log(S)
I indexed the 20 areas by a column with the number of each of the
areas and have been trying to formulate a code to iterate this procedure
for each of the 20 areas and save the results in a table, but I have not
been successful.
Do anyone...