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2005 May 24
2
Basic matematical functions with NAs
Dear All,
I've tried to sum columns -- different species of flowers, fruits plus twigs -- with NAs to get litterfall/trap, and then after use litterfall to calculate production (litterfall (grams)/ hectare/ day. But R 'sees' litterfall/trap as a string.
My question: How to use basic mathematical functions to deal with NAs in data management.
Example (as you can note I have many