| isMissing | R Documentation | 
Take a vector and return a vector of boolean values indicating which input vector values are missing (NA).
isMissing(x)
| x | vector | 
A vector of boolean values indicating which x is missing
isNumeric, asNumeric
temp = data.frame(id = 1:4, nom.time = c(5,NA,7,NA))
isMissing(temp$nom.time)
temp[isMissing(temp$nom.time),]
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