Re: [R] NA erase your data trick

From: Petr Pikal <petr.pikal_at_precheza.cz>
Date: Tue 17 May 2005 - 16:43:47 EST


Hi

Maybe

tcn5[tcn5 == -9] <- NA

if tcn5 is matrix

> mat<-matrix(rnorm(100),10,10)
> mat[5,6:7]<- -9
> mat[mat == -9]<-NA

Read some intro on data manipulation, it helps you to avoid thinking in loops

Cheers
Petr

On 17 May 2005 at 1:37, Anders Schwartz Corr wrote:

>
> Oops,
>
> I just erased all my data using this gizmo that I thought would
> replace -9 with NA.
>
> A) Can I get my tcn5 back?
>
> B) How do I do it right next time, I learned my lesson, I'll never do
> it again, I promise!
>
> Anders Corr
>
> > for(i in 1:dim(tcn5)[2]){ ##for the number of columns
> + for(n in 1:dim(tcn5)[1]){ ##for the number of rows
> + tcn5[is.na(tcn5[n,i]) | tcn5[n,i] == -9] <- NA
> +
> + }
> + }
> >
>
> ______________________________________________
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Petr Pikal
petr.pikal@precheza.cz



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue May 17 17:34:26 2005

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