[R] Getting mean in a dataframe

[James D Forester]

Gang Chen-3 wrote:
> 
> Sorry to hijack this thread. I have a similar but slightly different  
> situation. Using the original poster's example, how to elegantly get  
> the mean of column V2 when column V1 is either A or C and F1 is 0?
> 
> 

I am not sure if this is elegant, but it works:

a=mean(mydat$V2[mydat$F1==0 & mydat$V1 %in% ("A","C")])
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