> open<-c(2529,2468,2417,NA)
> high<-c(2529,2483,2419,2419)
> SSEC<-data.frame(open=open,high=high)
> SSEC
open high
1 2529 2529
2 2468 2483
3 2417 2419
4 NA 2419
> which(is.na(SSEC),arr.ind = TRUE)
row col
[1,] 4 1
> na.omit(SSEC)
open high
1 2529 2529
2 2468 2483
3 2417 2419