Sherri Heck wrote:
Hi All-
I have a data set (spdco2)
> spdco2
[,1] [,2] [,3]
[1,] 1 5.4 382.4212
[2,] 2 5.1 383.0315
[3,] 3 4.8 383.9520
[4,] 4 4.7 384.4376
[5,] 5 4.7 384.5929
[6,] 6 4.4 384.8864
[7,] 7 4.1 385.2156
[8,] 8 3.8 385.2919
[9,] 9 3.7 385.5925
[10,] 10 3.9 385.6801
I am subsetting it to output when [,2] is >= 4.7 .
x<-subset(spdco2,spdco2[,2]>=4.7)
This works, but I would like to add 'NA' to the data that it does
exclude based on my subset criteria. I have searched through the
archives and two R books, but I cannot figure out how to add the NA.
Any suggestions would be appreciated-
Use is.na():
x <- subset(spdco2, spdco2[,2] >= 4.7 | is.na(spdco2[,2]))
Make sure that the inclusion or exclusion of the row can be computed:
TRUE | NA is TRUE, but FALSE | NA is NA.
Duncan Murdoch
Duncan Murdoch
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