[R] NaN - trouble fixing NaN

[Jhope]

Hi R-listers,

I am using the package plyr. I am just trying to get the hatching success
mean of each nesting event and have typed in the following and received the
below results: 

> tapply(HSuccess, Aeventexhumed, mean)
        A                    B                  C 
0.2156265 0.1288559       NaN 

What can I do about NaN? I should be able to get a result for event C
because I was able to make a boxplot graph with this information showing all
three nesting events (A, B, and C). 

Please advise, 

Jean

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