[R] NA erase your data trick

[Petr Pikal]

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 at precheza.cz