I've been trying to figure out why the following is happening....
I've got some data I'll load in from a file...
rm(list=ls(all=TRUE))
trees <- read.table( "c:/cruisepak/data.txt", header=T)
trees$ct <- 1
And when I create some temp variable, then split the data to perform further
processing, the additional column doesn't maintain the data correctly....
mtrees <- trees[trees$m == 1,]
ctrees <- trees[trees$m == 0,]
The results are as follows...
> trees
plot tree m sp dbh tht ct
1 1 1 1 DF 44 185 1
3 1 3 0 DF 40 192 1
.....blah, blah, blah......
6 1 6 0 DF 26 156 1
8 1 8 0 DF 26 155 1
but,
>mtrees
plot tree m sp dbh tht ct
1 1 1 1 DF 44 185 1
2 1 2 1 DF 38 188 NA
17 2 6 1 DF 26 174 NA
26 3 1 1 DF 42 185 NA
and
>ctrees
> ctrees
plot tree m sp dbh tht ct
3 1 3 0 DF 40 192 NA
4 1 4 0 DF 33 148 NA
5 1 5 0 DF 43 182 NA
when the value of ct for all the records in all the data.frames should be 1,
not NA.
Why is that? Am I missing a step here? I'm running R 1.7.1 on Win2k.
Jeff.
---
Jeff D. Hamann
Forest Informatics, Inc.
PO Box 1421
Corvallis, Oregon USA 97339-1421
(office) 541-754-1428
(cell) 541-740-5988
[EMAIL PROTECTED]
www.forestinformatics.com
---
Jeff D. Hamann
Forest Informatics, Inc.
PO Box 1421
Corvallis, Oregon USA 97339-1421
(office) 541-754-1428
(cell) 541-740-5988
[EMAIL PROTECTED]
www.forestinformatics.com
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