[R] adding NA to "subset"

[Sherri Heck]

Fantastic!  Each suggestion worked beautifully.  Thanks so much.

Henrique Dallazuanna wrote:
> Try this:
>
>
> is.na <http://is.na>(spdco2[,2]) <- which(spdco2[,2] < 4.7)
> spdco2
>
> On Thu, Sep 4, 2008 at 4:21 PM, Sherri Heck <sheck at ucar.edu 
> <mailto:sheck at ucar.edu>> 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-
>
>     thanks!
>
>     sherri
>
>
>
>
>
>     x<-subset(spdco2,spdco2[,2]>=4.7)
>
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>
>
>
> -- 
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O