[R] missing values

[Chuck Cleland]

Ulrich Leopold wrote:
> how can I exclude the missing values in the following example:
> 
> tapply(lsk0t50$Pox2, lsk0t50$ProfN, sum)


tapply(lsk0t50$Pox2, lsk0t50$ProfN, function(x){sum(na.omit(x))})

Hope it helps,

Chuck
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