[R] invalid 'mode' of argument?

From: Kang, Sang-Hoon <kangs_at_ornl.gov>
Date: Wed 10 Aug 2005 - 22:13:28 EST


Dear Colleagues,  

As a novice I was trying to calculate Shannon diversity index using diversity function in vegan package and kept having same error message.  

Error in sum(..., na.rm = na.rm) : invalid 'mode' of argument  

My dataset is from microarray and have abundant missing values, so I tried labeling them as NA and 0, but still same error message.  

Shannon index is negative sum of proportion times log of proportion, so I put 1 for missing values to avoid log 0, but still same error message.  

What do you think I'm missing here?  

Many thanks in advance.  

Sanghoon Kang.  

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