This might help the first question:

> da <- (-1):1
> x <- data.frame(a1=sample(da,10,TRUE), a2=sample(da,10,TRUE),
a3=sample(da,10,TRUE))
> x
   a1 a2 a3
1   0  1  0
2   0  0  1
3   0  1  0
4  -1  0 -1
5   1  0 -1
6   1  1 -1
7   1 -1 -1
8  -1  0  0
9   1  1  0
10  0  1  0
> is.na(x[1:3]) <- x[1:3] == -1
> x
   a1 a2 a3
1   0  1  0
2   0  0  1
3   0  1  0
4  NA  0 NA
5   1  0 NA
6   1  1 NA
7   1 NA NA
8  NA  0  0
9   1  1  0
10  0  1  0
>



On Mon, Jun 9, 2008 at 11:18 AM, Michael Pearmain <mpearmain@google.com>
wrote:

> Hi All,
>
> Newbie question that i'm sure is easy, but i can't seem to apply properly
>
> I read in a datafram from a CSV file and i want to tell R that from coloum
> "n_0" to "n_32" the value "-1" is missing data
> i was looking at the
> is.na(xx) <- c(..,...,) idea but i can't seem to apply it properly, can
> anyone offer advice?
>
> On a side issue while i'm asking i have a an XML that i intend to use to
> add
> value labels and variable labels to the dataframe (using a python script)
> but i can't seem to find the syntax for adding value labels? i.e  1=Male
> 2=Female
>
> the labels command doesn't look like the one i want to use, and i've
> searched the archives but to no avail (maybe it's a too simple, but i have
> looked)
>
> Any help willing accepted
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

	[[alternative HTML version deleted]]

