Message-ID: <48C041CE.3050609@ucar.edu>
Date: 2008-09-04T20:15:10Z
From: Sherri Heck
Subject: adding NA to "subset"
In-Reply-To: <da79af330809041239h6ffc8a67we9b7f0b824960ca6@mail.gmail.com>
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-Paran?-Brasil
> 25? 25' 40" S 49? 16' 22" O