Dear Sherri,
Perhaps:

spdco2=matrix(scan(),ncol=3,byrow=TRUE)
  1  5.4 382.4212
  2  5.1 383.0315
  3  4.8 383.9520
  4  4.7 384.4376
  5  4.7 384.5929
  6  4.4 384.8864
  7  4.1 385.2156
  8  3.8 385.2919
  9  3.7 385.5925
 10  3.9 385.6801

spdco2[,2]<-ifelse(spdco2[,2]>=4.7,spdco2[,2],NA)
spdco2


HTH,

Jorge


On Thu, Sep 4, 2008 at 3:21 PM, Sherri Heck <sheck@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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